the tinker
Cruisin' on my Bluebird
Your old frame turned into a really great build. I think that threaded hole was for a grease fitting. It was pretty much a gimmick. Sears used it on some of their early Elgins. Is there a chance that the Headbadge was replaced? Lots of old bikes lost the badge and a kid replaced it with whatever was handy. I didn't notice any screws in it. If so, it would be interesting if another early badge would fit any existing screw holes.