11x 1.25 metric is indeed a reality. Both the seal belt bolts and the shoulder harness bolts are so threaded. Brutalizing a tap or an SAE bolt thru the welded hole also works- if the tack-welds don't break during the exercise!. Interestingly, the identical thread is included in my Sears tap & die set, and I just finished using both the tap and the die for a mod involving Yamaha motorcycle banjo fittings for a brake line.
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