Stripped spark plug bolt holes

[auttycat]

Changed my plugs today and now the two inside bolts won't go back into their holes. The top of the holes are stripped but a longer bolt would hold. Any idea where to get longer 10 mm bolts that will fit the hole? I assume not any kind will do because it may be fine-threaded or something like that, or am I wrong?

 

[Rock'n Roller]

You can purchase replacement metric hardware at Home Depot or Lowes. You need to determine if the existing bolts have fine or course threads. Use the end of a small screwdriver placed down into the hole to estimate the hole depth. Take the bolt with you so you can match the thread pitch. Make sure you get a replacement slightly shorter, so it won't bottom out.

 

[auttycat]

You can purchase replacement metric hardware at Home Depot or Lowes. You need to determine if the existing bolts have fine or course threads. Use the end of a small screwdriver placed down into the hole to estimate the hole depth. Take the bolt with you so you can match the thread pitch. Make sure you get a replacement slightly shorter, so it won't bottom out.

Sorry, but I believe it would need to be longer wouldn't it? The problem is the top of the bolt hole is stripped, if I put the old bolt in (without the coil) it screws in fine, so I think I would just need a longer bolt.