His username on here is scarr52, he is a very experienced builder with lots of knowledge on modifications repairs such as welding magnesium cases for instance
www.mechanicstoolsandbits.com
Scarr is Shaun, no fear on the 10mm helicoil definitely works well on that small application I fixed the spark plug threads on a br 200 Stihl with one and it’s been good for 3-4 years now. Plugs been pulled a couple times too just to change it, on the regular size spark plugs I use an actual thread cert if I have room and anywhere else if I can but on the 10mm spark plug the helicoil is great.
