How is it not the fault of the shop when they were the ones removing the glow plugs and broke it off.
YES its the mechanics fault when he broke it when removing the glow plug
Just the thing I was thinking, it's their fault and the repairs to the head is their cost.
Case point:
I had just replace my front axle brake rotors, in three thousand miles the right U joint went bad, into the dealer for repairs. The mechanic took a short cut to remove the rotor and use a BFH and damaged it to much to be used again. Wanted me to pay full retail to replace. I said no, I told him to bring the service manger in to look at it. I had my shop in Idaho on the phone to confirm the millage of the new rotor. Service manger said split the cost at whole sale for the part. Again I said no, bring in the owner. The owner comes to me and states he will take care of it at no cost to me. SO STAND YOUR GROUND when dealing with shops you don't have a relationship with.