I have a Technomate TM2600 motor but despite doing up the cross bolt as tightly as possible there is still a few degree play in the motor arm so with a bit of wind it shifts. I've got a spare one which when done up tightly feels solid. Before I go through the pain of switching them over any ideas to what i can do? Seemed to happen when we had those strong winds so i suspect it needs stripping down to work out the issue