Over the weekend Bob had some motor crazy noise develop, at first we thought a valve, then maybe a bent push rod. So we take the push rods out to check them & of course one cork gaskets immediately went missing. We hunted for a while and turned to looking for an alternative. A little massaging with an X-acto knife and the Grolsch washer worked perfect with zero leaks, I'm not sure how long they'll last but it'll get you home.
A little push rod adjustment and Bob was back on the road
Throw a few in your tool bag.
*cork gasket was found the next day laying in the street.