We have a gate on the back fence that opens with a chain and a motor. After solving the problem with the gate for 2-3 years, I assessed the situation and found that the chain was rusted and bent. So instead of calling a gate mechanic, I found out what size chain we use. It was delivered promptly. Completing the game was pretty easy. It's pretty hard work. This was done in just a few minutes. I ordered the tool offered, which made the job easier. An additional link to disable has also been added. So for about $20 I fixed the gate problem instead of calling a mechanic who would probably charge me $100-$200.