- Apr 22, 2020
The inside of the mainshaft has indeed a rough finish, that is why the slot has to be 5- 6 mm long and polished.
The idea is that the O-ring stays put, and the rod slides.
The waisted part is 4.5 mm in dia..
O- ring from an (old) Amal set screw (everyone has those lying around..)
Although 2 pieces is the better way , machining the existing rod is really no problem.
Cheap and easy, no extra nuts that can come loose or won't fit..
Thanks for the specification and note on where the o-ring came from.