When you set off trying to get an older machine whose support/service/parts are not available to work properly you have to do it yourself. No matter what.
If you cannot afford the time or have no know how of its workings its best to stay away from such feats. Or it will quickly become a basket case and your bank account will suffer.
In your such case its of best interest to buy a new machine, use it till it works then throw it away, leave the resto work to other guys who can actually make use of parts which look like junk
Myself I am a UC Consultant by education - but have other business which involves cars/trucks and bikes too. - It does not warrant that I was a mechanic helper at any time of my life, I studied for that too :). Referring to your such case - If I were to change my home's kitchen faucet, I would study it - see if its doable without any risks (save some money and time) or if risky get someone qualified to do it. <-- very seldom. Now that did not make a plumber did it?
I know how it feels to be stung. It could have been avoided by carefully measuring the consequences of what you are going into, as there is no factory to complain to, no support to phone up, and you yourself did not at least read the repair manual. You basically left it on one person, whose work you could not measure during or even afterwards.
It may seem that Im pointing fingers at Pakistani Talent for no reason, but its normal to be aware everytime in every case as businesses and services will not think twice in robbing you for a quick buck.