Thanks for posting those pictures and observations Alan and YHR very usefull indeed. As soon as I get a few days off work I'm off down to the local electrical shop for a few microswitches. I will keep you all informed of progress. I,m also going to try and rig an Asiatam unit to run off Tamiya electronics by direct wiring the elevation motor via a JST connector then wiring the recoil unit using your diagram and a new reliable microswitch ( the origional was knackered from new ) and in theory it should work fine. I must also look round for some weaker springs for the return on the recoil ( might use small elastic bands for testing ) All the best for now guys
Alan