Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I am new to this board, but it seems like the kind of place I can get straight answers.

I have an older Ariens ST1136. The muffler was threaded directly into the block and those threads wore out. I purchased an adapter from B&S that bolted into the block and then the muffler screwed on to the coupler (with a female/female coupler). My issue is the bolts keep working loose and the muffler falls off. I have tried thread locker, but that did not seem to help. The muffler sits about 10 inches from the block (8 inches of muffler, coupler and adapter).

My questions are:
1. Is there another way to lock the threads? I was thinking JB weld
2. Is there another muffler combination that works better?
3. Is there a way to brace the muffler to lessen the troque?

Details (if these help)
Engine:
Briggs and Stratton 11hp
Model 252416
Type0632-01
Code 85092410
Muffler B&S part # 391569S
Adapter B&S pert # 392700