Spray the mount with brake cleaner to degrease it. Put release agent (Pam spray or sizing wax works well) all over the carry handle, the hole, and the screw and nut of the mount (all threads!). Also put it on the non-interfacing parts of the mount. Put Acra-glass bedding compound on the bottom and sides of the mount and push it into the carry handle. The parts you glass should be perfectly clean from the brake cleaner so it sticks well. Wipe all excess and tighten with a pair of pliers. Wait. Pray that you got release agent on everything. The next day pull it apart...it will be tough, but it should come out if you did a good job with the release agent. now you have a custom fitted mount that will not move in the carry handle. ta-da.
Note, if you DON'T get the release agent everywhere on the mating surfaces, the two will be almost permanently stuck together.
BTW, I wasn't trying to tease you. I have tried to help fols before and after typing a long and detailed post, I was panned. Now I just give a hint until the other party shows interest.