Cleco heaven here, I broke one drill bit off and need to extract it when I pull the panel off for Sika prep and Sika. I'm using the small "X" rubbers for tile installation on the center chassis frame, it give the Sika bead a thicker and stronger bead! I put a 3/8" bead down each frame section then push a "X" right into the sika then install the skin! You can't tell it from the outside, it works really well!