I'm using the stock rear mount on the stock Hacker....I used those little allen head servo screws (1/2") with the built in washer from Don's Hobby Shop. Right before the screw head is seated, with a little thread still showing, I put a very small drop of canopy glue on them and then tightened them. Kind of like thread lock for wood I guess. You can still get them out if needed though. Plus being allen head you can use a ball end driver to negotiate the angle, etc.....

Seems to hold just fine.....

Bob