Does anyone know how to adjust the pull down black out shades GD puts in their RV's? They go up very slowly and then stop about 2/3 of the way up and I have to hold the bottom of the shade up so there is no weight at all on the shade. They then will continue the rest of the way up but it's very frustrating, that I have to work at it to get them up every time. I've tried turning the adjustment wheel both directions and nothing helps. I've done this to every one of my shades and I get the same result. Thanks in advance for any advice I get.