Thanks. A friend here in the UK has just told me he saw someone using an E flite retract in an electric model this evening - one leg hanging down!

I have just cleaned and re-worked my 30 year old all metal retracts, with longer (7") legs and 3" wheels. At present a 17 kg cm servo only just manages to lift the legs, despite a helper sptings build in. On the other hand, stall current is only 250 mA so no electronic trip needed, or there to cause other problems.

And it lifts them in half the tme.

The torque of 2 wheels trying to fall out of the wells is about 2 kg cm so as yet not clear why 17kg cm servo is struggling - I must look more cloaely at the geometry and particularly anything that slides to generate friction.