Quote Originally Posted by english_1969 View Post
Here is an image. The temporary wingnuts are attached to 1/4-20 threaded rod. When I fly this, I use regular nuts and lockwashers. (no need to point out that the wingnut overhangs the diameter of the AV-Bay).

The 1/4-20 forged eyebolt is attached with a fender washer, lockwasher (or locknut), nut and a dab of epoxy. Each bulkplate is actually two plates epoxied together.

This design came with my vindicator, hellfire, frenzyXL and competitor 4 so I assume the design is fine. However, I was asked by someone to consider the forces on these plates so that got me thinking about the strength of the plates as the force is residing on the plate and being spread to the fender washer on the eyebolt, then the washer/nut (x2) and then plate again.
Yours is a very common design and the problem is that the force transfer is a bit below optimal. I have used this design on a few AvBays and most likely you won't have a problem unless you get a vigorous ejection, say if the main pops during thrust or something really bad like that. Even than, you probably wouldn't get a complete failure. You could beef-up the connection similar to Windeavor's design if you're worried, but two G-10 plates will take a lot of stress.

--Lance.