[Updated] It is therefore important to read the guide. If you first insert the base into your item and then insert the center piece halfway, everything will work fine. Rating changed from 1 star to 4 stars. reading is difficult. [/update] I'm using these with a Leviton 49605-30W (made of translucent ABS RF) and these pins get me banging through the drywall I just ripped and repaired to put the case in. You are terrible. .I can't even INSERT them into Leviton products to fit in the case. I tried it with my hand and it didn't budge, so I carefully tried to use tools (pliers etc) to push it in and THEY BENT. If like me you think it would be nice to have a case module, forget it. I'm still looking for an alternative product because I refuse to drill holes in my case if there are ALREADY HOLES in it. What sense? I'll call Leviton soon. I'm assuming the case is thicker than standard metal cases, but they should have taken that into account. I will update if your answer is satisfactory.