I had a bad idler pulley wheel and bearing assembly. I bought a replacement and when putting dryer back together, there is slack in the belt instead of being tight like it was upon unassembly. i have it around the drive shaft of the motor and pulley wheel the way it was originally. I cannot figure out where I am going wrong. Is there another pulley on the other side of the drum too? I dread taking it all back apart, but will feel better about it if I know it will be fixed the next time. Thanks for anyone who can help.