I am building a GP .40 sized corsair and installing push/pull type retracts. I'm trying to get everything set up so that I can use a servo for each strut. Right now I am toying with a Hitec 75BB, 180 degree retract servo. My problem is that I don't need all 180 degrees. It is perfect gear up (holds with no play), but gear down it rotates to approx. 120 degrees then stops due to the stops on the gear mechanism. It holds the gear down great with no buzzing but this can't be good over time can it? Or are 180 degree servos built to not go all the way when resistance is felt? If teh above is bad, can I use a proportional servo for retracts where I can set the endpoints? Hitec says that the 77BB is the same as the 75BB I've been messing around with but proportional. I can't find any torque specs on the 77BB to confirm. So am I ok to use the retract servo at 120 degrees rotation and/or is a proportional servo safe to use in a retract application? Thanks!