If you Are working outside be alert to temp
aluminum changes shape like crazy with temperature
The main sheet track pictured took a full day to install
the first attempt was at 0800 on a cold winter day ... during the dry fit the holes would not align. Temperature too cold
I might be impossible to align the old deck holes with the new track holes
Plugging the old holes with epoxy bog then shifting the new track clear of the old filled holes is very common
the use of several tall studs , three inches tall taped into the substrate are commonly used as...
Bog up both the male and female threads ...bolt threads and hole ...both .need to be bogged up or the joint will leak . Water must be kept out of the counter sink or corrosion will form on the shoulders
Caulk is cheap ... use plenty of caulk
Take care on the boat interior by...
And always use a drill guide to keep fastener centered , perpendicular and to avoid eroding the anodizing
typically custom made by the machinist in the yard for each type track or toe rail
top photo is a drill guide for the last Genoa track I mounted
It is simply an Old prop prop shaft...