Spark plug inserts -another al/bronze video (2015)

Jim, I’d gladly take a pair too.

I guess I've been lucky because in all these years playing with old Britbikes, I've never stripped a plug hole or an exhaust thread. Now that I've said that, it will likely happen next week. I have a box of helicoils for 14mm spark plugs and have never used one.

I've used silver anti seize to help prevent galling but find little left from heat melting it out plug threads, so now use Milk of Magnesia which drys to a solid jamming threads but on 1/4 stiff turn out, becomes a lubricating powder. Took the straining terror out of my lawn mower bolt on cast iron manifolds instead of sweating/swearing about to strip nuts or now socket head bolts or even get enough leverage in tight quarters. MoM is what I use on exhaust rings too. Pink or white works the same. If planning ahead set some out to evaporate thicker so more stays on till screwing.

If worse case, not enough meat left to put any thing in that don't intrude on valve seat, might remove seat, put alu plug in hole, thread new hole and re cut valve seat. Still think the alu repair rods would do it, melts under 700'F, then hardens good. Head alloy melts ~1200'F and hot tuned heads don't exceed 500'F or likely melting-burning pistons by then, so blowing plug right out would save engine, sheeze.