What I have done is to grind the rivet heads off the chain pins n trhe same link on both sides. Couple the new chain to the old one and run in with the power of the machine. Lay the new chain out on a piece of plywood or some such thing. Have an assistant keep bumping the clutch while you feed the new chain into teh hooper and pull the slack out of the old chain. Everything will slide right through, you may have to tug some to keep the chain coming back on the return side but in mere moments you will have the new chain in place. Then pull the pins out of the temporary connection and make your connection up in the hopper. Back the adjusters all the way off and hook a comealong or binder across a couple crossbars to give you slack enough to work with.