Thats tight, but I guess that the insane force worked out by the pressure is not much compared to the friction it has.
Also note that the difference in balls can be larger then the difference in pipes.
How many different balls have you tried?

A couple of dozen (I work at a golf course part time ...

OK, I sanded the inside with a sander plug (giant hassle). It's pretty uniform now.

The ball still doesn't roll through by itself, but if I stand the barrel on one end, put the ball at the top and help it by raising the tube about 6 inches and drop and bounce it off the floor, it will move all the ...

Thanks guys. I appreciate the help. I'll post a picture of my effort when it's together.

T

Hey Long-T, how much force is required to push the ball down? Can you do it with one finger?

Welcome to Spudfiles :)

Nope.. I have to jam it pretty hard in spots.. I'm wondering if I just got a bad stick of it. Some spots seem tighter than others. It was laying outside in a pipe yard all summer ...

OK, so I saw a couple of size posts on SDR-21 AFTER I searched high and low and went across town to buy a stick of the hallowed stuff.. So... the golf ball... Just how tight is it supposed to fit? It's a little tight and I'd be bummed if the sucker blew up in my hands... If I sand out the inside ...