I removed and polished the lense on my 70. I see there is an adhesive backing on the reflector. Whats my best bet to adhere it back to housing and so I can remove it in the future without breaking? I also want to make it sit flush against the marker lense.

Reflectors have a metal backing and double back adhesive, easy way is to pull this and replace with aluminum tape and double back adhesive tape, trimmed to the periphery (carefully) using a new, sharp, razor blade.

Of course once you stick it back in, good luck getting it out, that double back tape I use will make it near impossible