Originally Posted by Hotrod Lincoln
Here's a telescoping "double D" shaft setup that can be spliced into the worm gear shaft by a VERY skilled welding shop. I'd suggest TIG welding. It will be much stronger and safer than any other way I can think of to shorten the shaft, and you can shorten the mast jacket a corresponding amount.

www.ebay.com/itm/227402359459?

Jerry

Borgeson makes those. Along with u-joints that attach by locking set screw incase welding is an issue.