Re: best way to fill the trim holes??
It takes some practice but you can fill the holes with weld from the outside provided they aren't too big (I've never tried one more than about 3/8") - just start on one edge and push the weld across. Grind - carefully - after it cools a little. 80-grit flap disk works great.
I've found the welding works much better for me in quick, short bursts using solid wire and argon/CO2 gas
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