Hi:

I got a set of SA flaps a couple of years ago. Installed them with 3M
5200 adhesive (Black) AND the clips. Nothing has moved and I know
that the 5200 will NEVER let go. No holes, no rust no problems.

At work we use 5200 to mount "never to be removed" hardware on boats.
It is an amazing adhesive, far harder to break than epoxy.

3M  also makes a 4200 variety which you MAY be able to separate.

Ian Allan

94 Eurovan Westfalia
86 Syncro
85 Westfalia
02 Jetta 1.8t
89 Audi 80Q
02 Duramax 2500