Is this tool for adjusting hairspring collets?

[LittleWatchShop]

I have three of these.  Each with a different hole diameter at the one end.  They were in my Dad's watch bench.

I think they were for adjusting hairsprings collets (turning them).

  usting the pawl and index finger on Accutrons.

[rehajm]

The round end with the tooth looks just like the Bergeon collet tool. I paid up for a couple of those but they have been quite valuable…

…the flat end looks like the trowel in my shed. I suspect that end is for a collet adjustment while the wheel is still hanging on the cock, while the other end is easier when the wheel is removed and sitting in an anvil hole?

Edited December 18, 2023 by rehajm

[LittleWatchShop]

33 minutes ago, rehajm said:

The round end with the tooth looks just like the Bergeon collet tool. I paid up for a couple of those but they have been quite valuable…

…the flat end looks like the trowel in my shed. I suspect that end is for a collet adjustment while the wheel is still hanging on the cock, while the other end is easier when the wheel is removed and sitting in an anvil hole?

You nailed it. Bergeon 30017 has the same design on one end.  Not the trowel however.

[rehajm]

…if anyone reading thinks that looks like a nifty tool but balks at the price…if you’re servicing the kinds of wristwatches that need this tool- early to mid 20th century with a fixed stud, invest in the 30017-P first. ‘Trou’ .45mm. You may not need another…

…or invest in the tweezers with the holes and turn the roller.

[LittleWatchShop]

33 minutes ago, rehajm said:

…if anyone reading thinks that looks like a nifty tool but balks at the price…if you’re servicing the kinds of wristwatches that need this tool- early to mid 20th century with a fixed stud, invest in the 30017-P first. ‘Trou’ .45mm. You may not need another…

…or invest in the tweezers with the holes and turn the roller.

Or plug in your lathe.  I made this after my original post.

I dont have a knurling tool, but I can do hillbilly knurling by rolling the piece between two files.

[RichardHarris123]

What are the dimensions, I  might have a go at making one. 

[LittleWatchShop]

6 minutes ago, RichardHarris123 said:

What are the dimensions, I  might have a go at making one. 

I will check and report back

The tip starts at 0.18mm and narrows down to a point.  The hole diameter is 0.6mm.  I would have gone for a smaller hole but didnt want to deal with breaking bits this morning!

[rehajm]

49 minutes ago, RichardHarris123 said:

What are the dimensions, I  might have a go at making one. 

yah…to add..

…here’s my most used Bergeon size. ‘Trou’ is the hole size here but Bergeon sells them in .10 increments. In my mind you’re really trying to make sure it is similar to the collet width you’re working on so the tooth lines up with the break in the collet. To large or narrow and you risk slipping and/or snapping the upper pivot.

[watchweasol]

Hi. Many years ago in my youth I bought a set of three of these tools, red,black, green all different sizes with the adjustment tooth at one end and the plain seating end at the other. Best suited when the balance is on a stake or anvil.

[Marc]

Here's my set.

[watchweasol]

Hi that’s the same set as mine. Mine must be 50. Years old..

[LittleWatchShop]

1 hour ago, watchweasol said:

Hi that’s the same set as mine. Mine must be 50. Years old..

which means you are pushing 90??