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am i ok just buying a good quality hardened drill bit, using the rear as a guide, and then gradually drilling larger?
It's risky using the rear hole as a guide for drilling the front, unless you're using a drill press and a fixture to hold the fork in place, as it's very hard to keep the drill bit flat and level. The Paterek framebuilding manual specifically advises against drilling fork crowns that way. If it was me I'd work out where I wanted the centre of the new hole to be, use a centre-punch to make a punch point at the centre, drill the hole with a pilot drill and then move up to 6mm in two stages using successively larger drill bits.
Brommers
Netakure
if i wanted to drill a steel fork with a hand drill, which has been drilled on the rear but not the front
am i ok just buying a good quality hardened drill bit, using the rear as a guide, and then gradually drilling larger?
is there anything i should be aware off? it won't explode will it? burst into flames?