here is a little removable locking bar I came up with
The 5mm bolts slide easily thru 5/16" holes -- and the set screws are 6/32x 3/8" cone (pointed end).
so - tighten and loctite the bolts into the engine -- then drop the bar in place a add a dab of loctite to each set screw.
their job is to prevent rotation of either bolt .
a dremel disc can make a tiny dished spot on the bolt head for a solid engagement of the setscrew