I bought a used rolabar rake last year and have twice broke the universal joint at the wheel hub where the drive telescoping tube meets the wheel. This joint has a sharp angle but there must be thousands of these rakes in use. Has anyone had problems at this point or any idea why this is causing me a problem. I raked maybe 50 acres before it broke after being replaced. The gear box doesn't get warm so it seems to be running right. I must be doing something wrong but don't see it. Is it OK to back these rakes up? They seem to freewheel when backed up. I don't start with big jerks. The Telescoping assembly doesn't slide all the way out and I don't see what keeps it in the tube. Is that the way it's made? Any ideas will help.