RE: Servo Reversing Y Lead - Problems!!!
I purchased a couple of reversers and found that due to the small SMD pots that are used, the set values "drift" with temperature and humidity.
IMHO these things are NOT worth the grief. I ended chucking mine, as it always required fine tuning at the field.
As others have indicated, more channels on a TX mix, a reversed servo, or a more stable matchbox are better.