as per the title, at some point in the previous (and first) owners ownership the oil drain plug was threaded and a helicoil application was installed. Since I bought the big ol gal I've taken her for two oil changes and for whatever reason during the second oil change the helicoil thing came out with the bolt when they went to drain the oil. They only realised what had happened when they tried to put the bolt back in. Ultimately a new helicoil was inserted however it was a nightmare getting the bolt back in there, it was as if the thread was 1 or 2mm too narrow. I'm kinda fussy and with something as important as this I thought I just buy a new bottom end bit and be done with it, however one of the guys at the shop said its a simple fix where they remove the plate and have someone weld in a new plug. I'm not so sure....what are peoples thoughts on this...have a real cheap fix done on it or spend 10 times the amount on a new part + gasket etc?