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This method could also be used for the shift-lock-knob; the rise and shift functions seem to share the same parts (knob, c-clip, insert).

Diagram below:
131775

I found the trick to removing the insert, it just took more heat than that of boiling water.

I put the assembly on a stove burner while applying my home made extraction tool, and the threaded...

I just realized that enlarging the hole in the c-clip area isn't a good idea because it houses a little rubber flat plug that resides between the rise-lock-screw's end and the surface that it pushes...

The thumb screw is a single 3mm screw with a thumb head on one end, a c-clip groove in the other end.

As a last resort I have considered countersinking the c-clip cavity (with dremel or drill). I...

Yes, the thumb-screw is screwed-in all the way. BTW, having your FA in front of you may (?) not be useful because this c-clip area is usually hidden from view when the front standard is installed on...

After 15 years without a serious mishap, my beloved Horseman FA and tripod blew over on a gusty day in Escalante, UT, this past autumn.

Two components were damaged: the swing plate, and the "rise...