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Registered
Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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I would NOT grind on them at all. Have the one head properly repaired by removing the guide, prepping and welding the guide boss, then refinishing it by hand. The other head is junk so you'll need a good used one if you can find it.
The others may be OK, but only a VERY close inspection will tell you anything and I cannot offer constructive info without seeing them for myself.
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