Can't see enough to know but cylinders and hoses aren't a big expense
Couple hundred bucks
But based that he skimped on the final finishes, I'd be very wary of the bearing and disc.
The pita of just changing out bearings would be a problem for me.
I can't tell disc size but cheap thin blades break and don't wear for ****.
I'd check that real close.
I don't think spools and scrapers would be problem to find.
Biggest thing is knowing what he used to rebuild it.
You can buy a wore out piece of equipment and rebuild it yourself if your willing to put in the labor.
I can source you disc, bearings and cylinders.
Price isn't bad though
Might be worth it
Run it till its breaks and rebuild it right
If you have the time to rebuild it