I bought an old B100 to set up a boat for my six year old grandson and his dad. I paid a hundred for it and ordered oil, lower unit lube, plugs and a new rope. I was amazed that it started and ran first try. I need a new kill switch which is the rubber push button on the lower part of the case. The old one is broke off. Anyone know where to buy one and a part number? The flywheel is red and looks new so it may have been repaired before. The serial number is B100-1002916. Thanks.