you need to use 2" reciever tube. wont bend. and easy to make if you can weld. another thing is how are you goin to get it to slip, i doubt you have the ability to spline your own shafts....
I have seen people use hose clamps to ballance there driveshaft.
I guess the just move the clamp around untill it stoped vibrating.
I just got lucky with keeping it stright.
Interesting! You never seam to amaze me Tom! and when I read the sch 40 part, the first thing that cam eot my mind was sch 40 PVC, I was Laughing so hard!!!