My first post… I have a pretty old Makita circ saw - model 5600BR. I forgot that it had a R H threaded clamp bolt and assumed that it was a LH thread. THen proceeded to round off the bolt head with an impact wrench. I had to grind off the head to extract it and now I cannot locate a replacement clamp bolt. The only ones available seem to the LH threaded . Any ideas where I can get such a RH clamp bolt?