The shell is slightly too long by about 2mm. I found that the SO connector on my radios did not stick out far enough, but the bulkhead sockets are longer and worked fine.
I took a barrel connector and screwed it into the 90, then cut along the edge of the knurl with a hack saw all the way around. A Dremel with a cut off wheel would work too. The knurl is slightly more than the 2mm needed, but serves as a good guide and doesn't leave it too short. Hope this helps, I will see if I can find some pictures of it.