Hi John M G,
Also a big warm welcome from myself.
Hey I'm really glad that you've managed to find all the info that was required to solve your issues on your Model 45 Scotty. $50 is a pretty good price for one of these machines, but as always most of these machines just get shoved into the darkest corner by their previous owners as it's all too hard and expensive for that matter if the work has to be done by a lawnmower shop, thus they just sit there and rot.
Thank goodness for people like yourself that rescue these unloved machines and turn an ugly duckling back into a beautiful Swan.
Again a big warm

Cheers,
BB.