Hi Virus and Mod CJ,
Yes it's amazing what people do to avoid repairing something properly. As Jack has said it's unusual to see a trip release impulse starter fitted on a horizontal engine. It probably works but a bit awkwardly due to the engine being set back from the edge of the chassis frame.
I guess I need to ask the question what are your long term intentions with the mower, this way I can answer your questions appropriately.
Cheers,
BB.