The lobe on the ball end of the mirror and the gap in the retaining lip on the mount. This is the best I can do, but after you pull the axel bolt from the bottom, soak the seam with a good penetrating lube and wiggle the arm back and forth. Then line up the lobe by lifting as you move it back and forth to find the alignment so that the lobe can pass through the slot in the mount.
I did use stainless bolts and nuts to replace the lag screws. I drilled through the plywood blocks and had the DW hold the bolts while I barely reached them in the generator compartment to get the nuts started. Have not come loose again though.
Vicki and Mike, Aria 3901- The Wined Up Bus, towing 16 Jeep JKUR.
We had a mirror attached with only two screws. IN heavy midwest winds, it was unacceptable. I worked several hours to try to free the swing arm using WD40 and PB Blaster. I was probably making the mirror mount looser as I did this. Eventually we stopped at a truck trailer repair stop. I had them cut off the plastic cowling with a recip saw. One cut on top at each side of the swing arm. Then they put thru bolts washers and locking nuts after drilling out the holes. This is the way it should have been mounted. We probably will not reinstall the plastic cowling, just wire brush and paint the mirror mount fitting. You can see more details on FB: https://www.facebook.com/berne.stober/
I agree: Welcome aboard!
Ted is 100% right about getting some posts under your belt; before they allow you to add images.
In fact: I'm pretty sure that they're about ready to make up their minds about me...
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
Fine, I am just trying to help folks who will never be able to free the swing arm since its frozen in. My Thor Tuscany XTE is a 2016 and has seen camping in all lower 48 states. That plastic cowling as far as I can tell is nothing more than decorative. But even if cut the way I had, it can be replaced with perhaps some epoxy. Will of course have two seams where the cuts were made. I have posted most of the many repairs I have made on my FB account and some of the RV repair groups on FB. Ignoring FB will cause you to miss much good and useful information on RVing, just my opinion, take care.