I just bought a 18mm spark plug socket from Auto store and found out it doesn't work. Too thick. Looks like I need a thin walled 18mm spark plug socket which isn't easy to find at the local stores. I'm sure a motorcycle shop sells um but wondering is maybe a 12 piont socket might work. What have you guys done in the past when the tool kit is no longer with the bike you purchased and you need a spark plug socket that works?