Having a hard time getting these glow plugs back in my 2003, is this something that's normal to deal with? I measured the new plug with a caliper and it's about .2mm larger but that seems so little i don't know that it could cause that problem. My best guess is to pressurize the cylinder and try and use a gun bore brush or something to get some burnt carbon outta there. What do you guns think? Is there a reamer or anything sold or easy to make?