This item may border on the trivial, but posting the web page is far easier than researching the answer.

At 08:34 AM 4/27/06, Mike Michael wrote:
"Can you tell me the diameter and number of teeth on the MGA steering u-joint?"

Counting those damn splines has to be the challenge of the century. I have tried to do it on a few prior occasions and could never get the same number twice. But now I have vowed to succeed at any cost. So I got on my close up reading glasses, got it under a bright light, and took a needle file along. I filed a bright corner one one spline near the bolt notch for a starting reference. Using thumbnail for a pointer and place holder I counted up to 10 splines, then stopped to file another witness mark, and re-counted a couple more times to be sure. Even at that I filed the wrong spline once, but managed to catch it with a recount.

In the end I count 49 splines. The diameter over the apexes measures 0.744". I suppose it's supposed to be a nominal 3/4 inch spine.