Thread: Whats harder than a Cobalt bit
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Old 08-08-2009, 02:40 PM
vector1 vector1 is offline
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Cobra Make, Engine: jbl
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yup, start with a small bit and spin it pretty fast (drilling hardened bolts use fastest setting on bench press) and use a lube made for drilling, has higher sulfur content.

this thread is useless without pics!!
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