My starter on my Toro SS4225 can't turn the engine over (weak). Engine is free but putting 12V to the starter removed from engine bendix doesn't extend. I'm looking for a repair man for starter or an exploded view of disassembled starter. I see toro has superseded the starter with p/n 136-7880. I'm wanting to take apart and clean and lube the starter but don't want to destroy it in the process. TYIA