Hello,
I am building my second TopRCmodel Zero. Just needed one again since i sold it.
I used the electric retracts that you can get for the model, and i was very pleased with it. No problem with those as long as i had it.
This time however i decided to use Sierra retracts air. Fantastic good quality on them. I also use a Sierra retract air on a TopRCmodel FW-190 that i currently also are building. Simply great retracts.
Just some pictures of the Sierra system:
My previous one
