hello, I just recently bought a 2010 wrx. I was doing a transmission oil change and as I was cleaning the plug from all the metal shavings I noticed there were threads stuck on there. I put the plug back in and it no longer tightens. So, I wanted to ask for everyone’s opinion on what you think I should do? The plug is a m26x1.5x16. Online, there is a websites called Grainger.com that sells stainless steel helical insert repair. However the insert is 39 mm in length and I need 16. Would I be able to cut the insert to size? and it’s $400.