Clapper lock for slotting with a shaper

[Toolmaker51]

On the other hand, I haven’t used this thing as much as I thought I would, at least on the shaper.

I'm glad my suggestion might help you. I've done toolwork a l-o-n-g time, as many have; it's hard not to learn every day.
Lol. The use of 'this thing' goes back farther than any of us. Set-ups in planers & shapers are tough without one. And usefulness goes beyond tool height, including adjustable 'gauge block' under a sine bar. I use mine often with an indicator as a secondary height gauge.

If you think clapper of your machine is small....get a load of these!
https://www.google.com/search?q=hand...nt=firefox-b-1

http://www.vintageprojects.com/machi...tal-plans.html