Running a shaper - the compound

[Sunset Machine]

A couple more hours has me convinced that there is something wrong with the compound. Tool geometry or style doesn't seem to matter. Tight gibs make it dig in, loose gibs make it ride up. The clapping causes the handle to turn. Something is broken, missing, or worn out. I'll take it apart when I find the time, but somehow it needs to hold position a bit better.

Here's a picture of the thing. If you see it on Craigslist, run away.