Excellent, thanks for the picture!
Yes, that's exactly what I thought you meant. Great idea!
By the looks of it, my roller has been chewed to the point that it barely contacts the rails! I think you caught yours just in time.
Even if I used the pipe to force it out, I don't have a lot of contact space.
Bought the trailer brand new in August of 2017. I don't think the slide has even been operated 10 times.
I was thinking the roller was the wrong size, but it looks like it's just worn down.