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Success but it is a gamble
on February 9, 2017
I installed a pair of Moen SecureMount anchors on a fiberglass walk-in type shower but I did encounter a problem. Moen cautions about requiring a 3 and 1/2 inch clearance behind the wall but how do you know that prior to drilling.There is the possibility that you will have to refill the holes and abandon the project, so it's a gamble.
I am giving a detailed explanation that may help others in a similar situation. I drilled the 1 and 1/4 inch holes fine and installed the right side anchor but behind the left side, there was metal A/C heating duct work. When I pushed the pastic guide into the hole, it was protruding by about 1 inch. I cut the ends of the plastic guide and taped them. I inserted the guide into the hole and then the anchor with the pull tab. There are little saw like notches in the plastic guide that enable the anchor to be locked in against the inside of the wall when you pull the tab. For some reason, I was not getting the locking effect. So I kept tension on the pull tab and started screwing the bolt with the mounting plate. At some point, you have to remove the pull tab since it gets in the way, then, using my hand, I pulled outward on the plate and was able to secure the plate tightly.
I think the reason I had success was because the fiberglass was thin, maybe about 1/8 inches thick. If I encountered the same problem with a drywall installation, I would probably use the snaptoggle toggler bolt with the Moen plate.