The insert should be threaded all the way in from the inside until the shoulder bottoms out to help add some strength against pull out. Sand the outer bit that sticks through down to flush.Thanks to Blaine, I just went through this successfully with the SwayLoc and Savvy bumper. I used these to make it all work together.
https://www.amazon.com/dp/B01H0STYME/?tag=wranglerorg-20
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