Linhof Technika V - Ground Glass is Dim.

[stephenmcateer]

Here are handles: https://www.brownells.com/gunsmith-t...s-prod400.aspx

I use the #81, the #84 is hollow and holds up to to four bits.

Let us know if these work for you.

David

Thanks David. Off to take a look…

[stephenmcateer]

I got these to deal with those large diameter narrow slotted screws with which to my mind European makers of view cameras seem to be enamored: https://www.brownells.com/gunsmith-t...s-prod425.aspx

They are even described as being for "European style slots." These are hollow ground, in the US anyway this pattern of screwdriver tip is often called a "gunsmith's screwdriver". I don't know if Brownells ships to the UK, I expect that is some where in the fine print on their website.

I got the full set largely because I'm a tool weenie. You could scroll through the selection for the blade width(s) that you want, note that they say "blade diameter" instead of "blade width". As far as thickness, these come in .020 and .025 inch (.51 and .63 mm) thickness. I find the thicker ones are a very close fit bordering on a push fit in the screws holding the ground glass on my Master Technika 3000; the thinner goes in easily. If it were me, I'd get both thicknesses. But then I'm a tool weenie and I got the full set.

I have to wonder where Linhof and Linhof repair people get their screwdrivers.

Stand by while I track down the handle for these.

David

Thanks again David. I mailed them to ask which driver would be best for this application. [They have a .co.uk website and it appears they import from the USA, which is fine with me.]

[Bernice Loui]

Tools for working on precision/precise instruments are serious considerations. Lesser tools will damage the instrument being worked on.

Metric (DIN/ISO/JIS) spec slotted screws do not have the same dimensions as Imperial aka US of A "fraction" based screws. They are NOT interchangeable and the tools used to work then must be of the same specifications/dimensions.

Best screwdrivers for slotted head screws have parallel tips. These are known as hollow ground in USA tool industry. The most common variety have a radii ending at the screwdriver tip. This design is inherently weaker due to the unsupported area between the body of the radii to the screwdriver tip.

The best slotted screwdrivers made are PB swiss. Their slotted screwdriver tip design over comes this problem by forging the parallel tip area to fit the slotted screw slot.


This greatly reduces breakage of the screwdriver and transits most of the twisting torque to the screw slot instead of flexing. PB swiss uses as special steel for their screwdrivers. No idea what it is, just the set that has been used for decades has held up remarkably well.
https://www.pbswisstools.com/en/tool...t/pb-610000-70

Smaller slotted head screws are common in watch repair.. They have a different style of slotted screwdriver and they can be really small..
https://www.jewelerssupplies.com/scr...0.6-2.0mm.html

None of these high quality tools are "low cost"..
https://www.jewelerssupplies.com/too...ewdrivers.html

Ideally measure the screw slot width and diameter of the screw head to determine what size metric screw driver is needed for the specific slotted head screw.

Most common slotted drive metric screw is known as a cheese head..
https://fastenerengineering.com/what...e-head-screws/

~Most important to keep in mind, aluminum is very subject to corrosion. What often happens, aluminum internal screw threads can develop corrosion effectively "locking" the screw to the internal aluminum threads. The torque required to remove the screw can snap off the screw head leaving a serious mess of a broken screw in the aluminum part. If the screw is stuck, DO soak the stuck screw in penetrating oil for a day or more before trying to remove the screw. If the screw breaks off, it will ruin a lot more than just that day.~


Bernice

[David Lindquist]

Thanks again David. I mailed them to ask which driver would be best for this application. [They have a .co.uk website and it appears they import from the USA, which is fine with me.]

Good, it sounds like these are going to be easy enough to buy.

David

[stephenmcateer]

Tools for working on precision/precise instruments are serious considerations. Lesser tools will damage the instrument being worked on.

Metric (DIN/ISO/JIS) spec slotted screws do not have the same dimensions as Imperial aka US of A "fraction" based screws. They are NOT interchangeable and the tools used to work then must be of the same specifications/dimensions.

Best screwdrivers for slotted head screws have parallel tips. These are known as hollow ground in USA tool industry. The most common variety have a radii ending at the screwdriver tip. This design is inherently weaker due to the unsupported area between the body of the radii to the screwdriver tip.

The best slotted screwdrivers made are PB swiss. Their slotted screwdriver tip design over comes this problem by forging the parallel tip area to fit the slotted screw slot.


This greatly reduces breakage of the screwdriver and transits most of the twisting torque to the screw slot instead of flexing. PB swiss uses as special steel for their screwdrivers. No idea what it is, just the set that has been used for decades has held up remarkably well.
https://www.pbswisstools.com/en/tool...t/pb-610000-70

Smaller slotted head screws are common in watch repair.. They have a different style of slotted screwdriver and they can be really small..
https://www.jewelerssupplies.com/scr...0.6-2.0mm.html

None of these high quality tools are "low cost"..
https://www.jewelerssupplies.com/too...ewdrivers.html

Ideally measure the screw slot width and diameter of the screw head to determine what size metric screw driver is needed for the specific slotted head screw.

Most common slotted drive metric screw is known as a cheese head..
https://fastenerengineering.com/what...e-head-screws/

~Most important to keep in mind, aluminum is very subject to corrosion. What often happens, aluminum internal screw threads can develop corrosion effectively "locking" the screw to the internal aluminum threads. The torque required to remove the screw can snap off the screw head leaving a serious mess of a broken screw in the aluminum part. If the screw is stuck, DO soak the stuck screw in penetrating oil for a day or more before trying to remove the screw. If the screw breaks off, it will ruin a lot more than just that day.~


Bernice

Thanks Bernice. This particular camera came from Japan — it has little areas of corrosion as though it has been stored for a long time. Nothing serious but I'm thinking these screws are probably, as you say, seized into the ground glass frame.

Actually, I'm not certain I want to get into high-torque attempts to get the screws out and possibly shearing off the heads. The ideal solution would be to send the camera to Linhof but £££… I have to think about this.

[Philippe Grunchec]

The ideal solution would be to send the camera to Linhof but £££… I have to think about this.

Send it to Munich, it will be €€€ instead of £££!

[Philippe Grunchec]

The ideal solution would be to send the camera to Linhof but £££… I have to think about this.

Send it to Munich, it will be €€€ instead of £££!

[Tin Can]

It is also easy to regrind almost any GG