I just purchased and assembled a new Ashford 8 shaft table loom. I'm having trouble getting a decent tension using the breaking system which is made out of plastic. When I try to tighten the tension with the front gear, the rear gear slips out of the break teeth. I read that it is not necessary to have a tight tension and to check that the gears are put on in the right direction. They're on correctly, but I still don't think the tension is getting snug enough. It's very loose. Has anyone else had trouble with these plastic tension gears on Ashford looms?