It looks like the dimensions are 13mm, 0.855" joint diameter, and a 3/8-10 joint.
Do any other companies make shafts that would fit?
I agree that it’s not that simple. The collar measurement will most likely be .855” or 843”. My G-Series is .855” and that may be what most of them are but it is no guarantee. The only way to know for sure is to measure your collar.
Your pin, if original, is definitely a 3/8x10. McDermott has used 3/8x10 with different minor diameters. That shouldn’t be an issue in your case, since the newer pins have the smaller minor diameter. It will likely only be a problem if you try to put a newer shaft on an older series McDermott butt. Since you have a G series, that shouldn’t be a problem.
Any tip size and taper will work. I have several McDermotts and like how they play. My favorite shaft has been the Predator 314-2. However, about 10 months ago I bought a McDermott Defy shaft. Not sure if I like it better but I’m still giving it a go. I also have OB shafts that, to me, are just average. You can buy any 3/8x10 shaft and it will work fine. Even if the collar width doesn’t match perfectly, it will still work fine. What is best for you is up to you.
I will end with, I really do like the 314-2 shaft. Both of my 314-2 shafts are just over 12mm, at the tip, with a pro taper.
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