Can not get any to start the only one that went pop was the old one.
Will pull them apart clean them up and have another go. Tomorrow. My sons shoulder is hurting him(he is the starter) and so is mine and my missus's. will let you know how i get on. The chat with the old fella was gold, he reckoned he should put anotherone in my car to make them not move. then the parts. can not get spark or check for spark on the rear sparkplug on the 170.