<snip>
special tool install the small clips for the wristpins. <snip>

You can use circlip pliers such as those available at a FLAPS ... or you
can use 2 awls ... one in each hand ... to compress the the circlips.
Careful they don't slip and let the clips fly away.

Circlip pliers can come in "Open when handles are squeezed" or "Close
when handles are squeezed".  If you are going to buy some, check that
they'll do the job.

Mike
Houlton, Maine