hi guy,
sounds like you will have to take the wheel apart and replace the broken rod and or pieces and reset the start switch. get a book you'll need one, there are a lot of parts in the colume.make sure that you disconnect the batt first, don't need fire or burnt parts. going to need some special tools to deal with it too, wheel puller, spring compressure, couple of steel picks and time alot of time if you havent done one before. just go slow and keep everything in order as you take it a part, if you drink coffee make some. good luck dave