Keep your bit oiled up, stops it clogging up with ali fillings, JB weld epoxy or aluminium solder/weld to address break through inlet side. I tig or Ali solder/weld if I break through the exhaust. Tried a few oils, ATF works quite well for me.
You can get a cheap £12 flexible extension for a dremel, works perfectly for a GX head, more control.
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