Attached you will see my solution. A little different than yours but same idea. I made a adapter plate to fit between the housing and the handle. Two screws from the plate into the housing one one side and two post that fit into the handle and one screw that goes through the handle, the adapter plate and connects to the housing. I attached Glued a extension on the shutter release so that you can trip the shutter while still holding on to the handle.
In regards to the tight fit of the UnderWater Camera Stuff 3.8" Precision dome that is fitting tight, make sure that your using generic silicone lube on the O-rings NOT OLYMPUS grease. If you still find that the fit is too tight you might try something just a little smaller that would stretch more and thus have less thickness. We use a 3mm x 74mm o-ring so you could certainly use a 3x73 or maybe a 3x72. The only concern would be that it doesn't leak. I prefer a tight fit as opposed to leaking.
- albert kok likes this