Oh Yes I need one for my EX21. Have had trouble with my wrist since I broke it a couple of years ago. Have real trouble with the top and bottom thumb screws. Great ideas Ray.
Marg
The thumbscrew wrench is made the same way as the drill press wrench - remove the thumbscrew (don't lose the swivel part on the tip of the thread). While it's out, you might remove the swivel part and give it a touch of grease, then replace the swivel and clean it off. Trace the thumbscrew handle on the blank with the offset angle as in the photo, then drill and cut with the scroll saw. Mine is kind of long at 6" - 3" would be plenty.
And don't use the wrench to tighten the thumbscrew. If finger-tight is not enough then there's something else that needs to be fixed.
This one is 3/4" thick birch hardwood - a scrap that was cut off a board from another project. About any wood or BB Ply will work for this thumbscrew wrench - it doesn't take much to break a stuck screw loose. But keep it small enough and long enough to reach into the lower clamp.