Ok, guys, lots of really good information here. Thanks!
Comparing my gizmo to the photos you provided, I can confirm that I have the Stuntmaster--which is what I was told by the guy that very generously gifted it to me. It looks like it is in new condition, with no issues. It has the 90 degree fuselage mount. (Bolt straight into a profile fuse.) I was advised to sweep the unit back about 5 degrees, so I was thinking of making a set of wedges along with a multi-hole line guide. That would make it easy to trim.
It has a pretty small button on it. Not sure it's going to easily handle the size monoline you are suggesting. Will have to make up a sample termination and try it.
Yeah, I figured finding a handle would be tough. The only challenging part would seem to be the spiral wand part. Not sure if I can control the tension well enough to wind my own. Maybe put a chuck in the wood lathe and some fixtures to control the tension and hand-wind it.... What diameter is the wire used on these?
If I had the wand, I figure I could either mold, spiroform or carve the nut/slider piece.
From the photo, it looks like the spiral piece ends in a yoke that would contain a button on the line?
I suppose that I will find out how many turns the handle has to go for full elevator once I set everything up. The aeroloads on the elevator have enough uncertainty in calculation that doing much optimization would be idealistic.
I was thinking of a plankwing trainer. I just built one last year for two-line. A bit bigger than a Baby Skyray, which I think are wonderful for trainers. Anyway, the new one is a bit bigger, actually has an airfoil and flies really well. In fact, I need to detune it a bit before using for beginners. But if the monoline needs to be pretty large diameter, then I might want to increase the size again....