I have been unable to find threaded stem wheels for 4 iron patio chairs because the threaded holes on the legs are only 7/32" in diameter. What do I need (tools and bits) to enlarge these holes and leave the holes threaded so that I can acquire threaded stem wheels to screw into the holes?
You need a drill to enlarge the holes to fit you bolts, and a "tap" to thread the hole to fit the bolt. Tap and die sets can be bought from any DIY place, or try Screwfix.
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