Thanks Tom, appreciate the input- I hadn't thought of that. The hole is from a previous build using a smaller frame, with the oval tubing on the moondog-I hadn't thought to use the set screw I had drilled and tapped, from that build.
....Although now that You've mentioned it, and I'm rattling it around in melon- that will be the first tune up for the Doggy today- I've put nearly 100 miles on her since that mod- Work yesterday 40+, and all my runnin when I'm not haulin' the Wife and Kids around.
Thanks again, I've learned that the only thing worse than overlooking the obvious, is knowledge of a potential failure going unused.
Just to add- Ive found a great help in using Loctite repair Extreme all temperature as a thread locker- use it all my bolts, holds up to high temps, even on intake manifold bolts... without a good threadlocker, I would probably gotten frustrated/tired of maintenance on the moondog.
Richard.