I ran all daytons until the mid 90's and then we began switching over to hub piloted. They make a tool called a torque stick thatis made for Daytons and torques them properly with an impact wrench. I think it is around 90 ft lbs. Overtightening is probably the main cause of trouble. The spacer has to be compressed a little to maintain the wheels in their position. If the spacer is crushed, the wheels will slip during hard braking and quite often tear the valve stem out. We made it a practice to install new spacers every time we replaced tires. We probably still have several dozen 20x4 spacers we will never use. Their main use today is in garbage trucks etc. because of their ability to absorb twisting like running over curbs and tight turns. If you inspect your spacer, and throw it away if it shows any signs of slipping before and follow oldiron57's instructions, you should have no trouble.
