The typical total actuation rod travel for most mechanical retracts is not a half inch it is three quarter inch and you will find the secret is using a round or star servo output wheel then not starting at rest with the S bend inserted in the output wheel lined up with the actuation rod but of to the side somewhere between twenty and forty five degrees.

And yes as I posted last nite I have never run across any retract servo that was proportional and all I have ever worked with will seek to run to the full limits of their travel regardless even when fighting binding linkage and transmitter endpoint adjustments do nothing.

All retract servos will have a full travel of just a hairs breath over 180 degrees. And the reason is you will find that is what it takes to acheve the full travel of the actuation rods into the zone where the gear locks on each end. The problem fellows always run into with standard servos is the typical travel of most of those is around 120 degrees (this varies slighty) and that is not enough to complete the full travel of the actuation rods. And when the fellows run into that and use very long arms them the power of the sevo is compromised an can not fully raised the gear.

Now some thoughts on the up as well as down locks. Both locks are at a tiny bit of travel at each end but the servo and the adjustment must be sufficient to move the actuation rod it full travel and into this small lock zone. How do you know you are fully gear locked on each end? Easy there will be a slight bit of wiggle both in the up and down position and this indicates the adjustments are correct and the gear is locked. This is the simple way to check your gear anytime both on the bench and at the field just extend the gear and wiggle each gear and feel for that play, then retract the gear and grap each wiggling slightly and feeling for that play.

If you feel no play or wiggle both retracted or extended then the servo is pull/pushing the actuation rod either to far and binding that will cause servo to use excessive current or the linkage has not move the rod far enough which means the gear is not locked down or will not retract far enough.

The Wiggle test is important both on the bench and at the field. Now some retracts provide a strategically located screw for minimizing the wiggle when in the down position but don,t get carried away with this as you will not be able to do the test. A slight wiggle of the mains when in the down position is not a problem for the airplane when landing.

Hope I have not confused but it is a difficult installation as I posted the first time.

John