Welcome to ModelEngineMaker !If you have problems registering or logging in, please use the contact menu option to request assistance.
The PTFE erosion was one of the reasons I opted to keep the PTFE out of the combustion zone. The other is it can give off some rather nasty vapours when exposed to heat above it's comfort zone. This is how I went about making my plugs below. The smaller plug is 4.5 mm thread shown against my standard 1/4-32, this smaller plug uses the same type of construction.My best regardsGray,