Leica IIIC reverse lever ring dimensions?

[dxq.canada]

This ring sits under the reversing lever ... I am trying to manufacture one.

 

[SyPat]

Have a look to M. Vanvaerenbergh, Leica IIIc et IIIf, manuel du réparateur. Hévillié: Edition Ker, 2013, with a lot of drawings and dimensions for individual pieces.
Your ring is: diameter 3,5 mm (external) 3 mm (internal); height: 1,2 mm

 

[dxq.canada]

Thanks. I made some guesurements and started with 3.75 - 2.85 - 1.35 ... I had to sand down the outside which matches to the 3.5 external ... the height is the one that I really need ... so thanks