Winch fasteners...

[atmarineservices]

Hi All, just in the process of moving my mast mounted wich on a delrin pad. The pad was installed backwards, causing the halyard toride up onto itself. No big deal, remove (stripped) fasteners and move to propr location and drill for rivnuts. After drilling for the rivnuts, I failed tt take into account the curved mast section, and the outer most fasteners will not line up. One did gall, and needs to be delt with tomorrow. Is it accecptable to use silicone bronze flat heads for a winch mount? The spar is aluminium, and tefgel will be standard. I say bronze beccause it has more flex that SS. I was thinking this, along with slightly fileing the winch mount to get the flathead fasteners to go in at an angle. Good idea, or bad idea?
Option 2 is to have a winch pad welded on this summer.
Any input?