In order to rectify the squishband width and height on two aircooled RD350 heads, I had to knock up this little tool.
But let's start at the beginning. Let's start with one sparkplug minus it's ceramic insulator.
Chamfer the lip of the old sparkplug to make pressing the shaft in a bit more easy.
Do some cosmetics to it and file in two flat spots so it can be undone with a 17mm wrench
And test fitted a head in the lathe - job's a good un'
And I am sure you want to see this baby spinning: