Make an ad­justable pis­ton stop

This is a handy tool to have in the work­shop – you can make one from an old spark plug, here’s how

Classic Bike (UK) - - News -

1First you need to re­move the ce­ramic part of the plug by turn­ing off the rolled edge where it goes into the steel body. This is eas­i­est to do on a lathe, but you can do it with a hack­saw.

2Now it will wig­gle out. Never try to smash it out, though – it puts up a fight, dam­ag­ing punches and fir­ing out shards of porce­lain. And yes, I have tried it...

3The next step is to snip off the earth elec­trode and find a tap that you can thread the body with – I used a 5/16in UNF, although an 8mm would make a good al­ter­na­tive...

4… be­cause 8mm threaded bar is easy to get. File the end of the bar smooth to avoid scratch­ing the pis­ton and add a nut and washer for lock­ing in place. Job done.

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