Don't want to 'teach granny to suck eggs' had a few on my various craft but
if you go down the drilling route
, it is fare better to thread the holes and us stainless countersunk bolts with a seizing compound, if you us self tapping screws they tend to fail dependant on there hardness.pop rivets work but need to be drilled out if altered which can be a pain, make sure they are marine
Cobalt drill bits are the tools , use slow speed with high pressure and cutting compound, if stainless gets hot if gets harder so the soluble oil
is the best bet put it in a plant mister continually sprayed on the drill site.
Ps : buy a couple of drill bits as they break them easily
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