Ok, THIS is what I need. I finally found a good picture of a coupler/u-joint that looks like it will work. The link is from Nab's go-devil sales.
http://www.nabsgodevil.com/options/images/upperbearing_big.jpg
You can see how there is a big bolt that is used to clamp down the coupler onto the shaft. Also appears to be a large sqare headed bolt or set screw that attaches to the shaft. I'm assuming this is what go-devil uses from the factory? They won't sell me a u-joint unless I have serial number to verify I'm a go-devil owner.
Anyone know how/where to get one of these u-joints?
http://www.nabsgodevil.com/options/images/upperbearing_big.jpg
You can see how there is a big bolt that is used to clamp down the coupler onto the shaft. Also appears to be a large sqare headed bolt or set screw that attaches to the shaft. I'm assuming this is what go-devil uses from the factory? They won't sell me a u-joint unless I have serial number to verify I'm a go-devil owner.
Anyone know how/where to get one of these u-joints?