surly old man
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
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Threads might be stripped. Very hard to tell from that picture. If so, they are cheap to replace. An LBS that has been around will have one someplace. Only a couple of bucks.
If it is not (and I would guess it is not), then keep trying. The threads are fine, so go gently. It goes in a lot more deeply than one might guess, so try to make sure you have it going right in the center and at a 90 degree angle to the hub.
Don't give up on it. A 3 spd that runs well is a fun bike.
Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...