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If that bolt is hardened (grade 8), you'll have a tough time drilling thru it with a hand drill. In any event, you'll want to use a high-speed 1/4" drill and filing a small 'flat' on the bolt where you want to start the hole will sometimes help.
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'67 912, '70 911T, '81 911SC, '89 3.2 Targa - all sold before prices went crazy
'25 BMW 230i coupe - current DD
'67 VW Karmann Ghia convt. & '63 VW Beetle ragtop - ongoing projects
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