High-Speed Sync for Speed Graphic

[maltfalc]

More importantly are they reliable.. i've tested my focal plane shutter flash and it doesn't fire about one out of 6 times, film is too expensive these days to live with that.

If I'm shooting a flash with my fp shutter, I use T, and just try to be quick about the operations (open shutter, flash, close shutter). If I was going to do a lot of flash photography with the FP shutter I'd create something to automate this process.

they're reliable if all the contacts are clean.

[Tin Can]

Which means clean the metal strips contact switch built into the cloth shutter

Delicately

they're reliable if all the contacts are clean.

[maltfalc]

Which means clean the metal strips contact switch built into the cloth shutter

Delicately

and the contacts behind the bipin connector, and the switch that breaks the circuit when the shutter release isn't being pressed, under the cover plate on the side.