Hi n welcome to IIS, Scott.
FWIW. I run my Meade 10" dob absolutely clean n dry. No ArmourAll at all, nada. Just clean it ocassionally n it runs real smooth on the Ebony Star I added. I have about 5 to 10 mm of free play between top n bottom boards. (real sloppy).
I cannot help with your call for 'where to buy' but there will be others along to point you in the right direction.
I think you can 'adjust the tension springs', but again, not sure of set up.
HTH..
L.