Hey guys just wanted to get some insight on what a possible solution can be. I had my tdi run away a month ago which bent a rod. I since bought a new engine and put that in. The guy I bought the engine from mentioned he repaired a glow plug hole by putting a thread insert in it. What he didn't tell me is he ended up drilling through the glow plug seat and now compression leaks out very easily. I have the engine running and it is timed perfectly, also timed the injection pump with VCDS. The car runs horrible since its only running on 3 cylinders. What is a good way to seal the threads on the insert and the glow plug in order to stop compression leaking out and making the car run terrible? I was thinking maybe some Permatex thread sealant on the insert and the glow plug but not sure if it would seal up straight threads well enough, the other option is to put a bolt in, instead of the insert and use a copper washer but nobody makes m12 x 1.0 bolts which is the insert thread size. Any help would be appreciated very frustrating to find out that the old owner wrecked the glow plug seat.