I have a Lancaster Instantograph but it has no way of securing it to a (modern) tripod. The base was in 5 pieces (now restored)and this I think was caused by someone attaching an alternative part (from a 1930s aircraft - I found the specs online) using three small screws. I suspect no pilot holes were drilled - no pun intended! - and this caused the mahogany to split.
Fast forward - I know you can get 3/8 to 1/4 reducers easily online. Is this what is used? I've tried looking at my Century Grand but it's hard to tell because of the leather covering. I would think just letting an adapter into the base would not be stable and some sort of fixing plate would be necessary.
Any info appreciated - or directions to thread etc. My searching skills must be woeful as I can't find anything.
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