Etachron Stud Dimensions - Homemade 'wrenches'

[Simeon]

I am planning on making some homemade Etachron tools from brass rod.  This will be flattened and formed into a a flat crescent, with a slot filed into it that will act as a wrench for turning studs. Would steel be better? I could use pieces of old mainspring that I have annealed to allow them to be filed to shape.

Does anyone know the dimensions of the studs?  Are they all the same? I know that there are differences between Seiko and ETA.  I only have one watch on hand with Etachron (an ETA based movement), I can measure this but I don't know if that would do for all ETA based Etachron.

[Malocchio]

I filed a Seiko regulator wrench out of a screwdriver.

[Simeon]

18 hours ago, Malocchio said:

I filed a Seiko regulator wrench out of a screwdriver.

Screwdriver is not a bad idea. 

I measured the movement I had on hand and I got 0.9mm x 1.3mm for the regulator block and 1.2mm x 1.7mm for the hairspring stud.  I am now thinking that I might just file a suitably sized slot across the end face of a 3mm brass rod that I might reduce in diameter at the tip.

[tomh207]

4 hours ago, Simeon said:

Screwdriver is not a bad idea. 

I measured the movement I had on hand and I got 0.9mm x 1.3mm for the regulator block and 1.2mm x 1.7mm for the hairspring stud.  I am now thinking that I might just file a suitably sized slot across the end face of a 3mm brass rod that I might reduce in diameter at the tip.

I have a couple of sets of Kif spring tools that have their own collet/handle set and have a similar idea to do this with brass rod. Should be a spiffy little set of tools and will likely try to make the same for diafix springs as well.

 

Tom