I am in the process of converting my first beater. Everything has gone smoothly...except for the lockring business. The cog came undone while I was fooling around in my apartment checking to see if everything was secure enough for the road. For some reason the lockring will not screw on all the way and there's a good 1/4" gap before the threaded step-up. The wheel was built out of scraps by someone I solicited on craigslist, so i don't know what specs of the rear hub other than it's a flip-flop. Did I buy the wrong size? Did I screw it on the wrong way? Do I need to purchase some sort of lubricant to force the lockring to screw on the rest of the way? Should I give up this project and cry?
These are the best shots I could provide to explain my problem.