When I install the prop adapter, I use a red high strength Loctite thread locking compound on the threads. I haven't found a starter that will loosen it, yet. Just make sure that you clean any oil from the threads before you apply the Loctite. When you need to remove it, just heat the adapter with a propane torch to around 300F, and the loctite will soften and come off. I drill a 3/16" cross hole in the adapter, to insert a rod to tighten the adapter.

Nashcat