Now that is brilliant John, never seen that idea before. My most used tools are not as sophisticated, sharpened leather punches to cut the O.D. and I.D. of seals, and wooden clamping system to hold the difficult Airsporter and Mercury trigger block squarely in the vice when putting a strong new spring in. Like this thread.
Oh, I forgot top of a pen to put new seal on piston dovetail...
Baz