Anyone with a lathe willing to make something for me?

[Bryce]

If you are going through a needle bearing, doesn't the shaft/sleeve need to be hardened to prefent the bearing from eating away at your sleeve?

That's a good point, 316 stainless is probably not hard enough for that.

Yes, otherwise you will get excess wear on the tube... I would suggest a hardened alloy steel shoulder bolt with the correct length shoulder.