I have a Hangar 9 P40 with electric retracts. I bought it used, but never flown. The retracts apparently are not locking in the extended position. There is alot of slop. Any suggestions on how to adjust them? I don't know the brand of retracts.

check to see if there is any kind of locking pin when extended. Pictures may help

It also could be the servo does not have enough throw to make the gear lock in the down position. Good Luck, Dave

What brand of electric retracts are they?

Electric retracts have their own actuator. No servos involved.

Mechanical retracts are driven by servos and setting up the linkages is a nightmare the first couple of times. My Hangar9 Hellcat originally took H9 mechanicals driven by one centrally located retract servo. They worked, but with the model balanced as recommended, it nosed over constantly. The H9 P40s weren't much better. I swapped those mechanicals for EFlite 60-120 size 95degree electricals. They have no slop, lock at both ends of the rotation, and have worked since day one.

If you've got one servo in your wing, what model is it?