I have a MM16 that's about 12 yrs old, i don't use it regularly, maybe 3 times a month but I've never had a problem until I was cutting with it today, after I finished my cut I hit the foot brake and it would stop the blade as long as I had my foot on it, as soon as I took my foot off the blade would rev up to cutting speed. I can stop it with the main switch so I'm thinking it might be the micro switch on the foot brake. Any ideas? Thanks.