the tsc one looks like a bad knock off of the newer spreader minus all the improvements newer spreader has made (and the quality construction).
As for hay mixed with manure, I don’t go out of my way to remove the hay when I’m filling muck buckets to dump in the newer spreader. Part of my clean up area is a hay rack which tends to be a mix of manure and hay scraps. You just have to drive in reverse at some point for maybe 30 feet and that has always cleared it for me (5+ years). The worst I’ve had is a few wisps in the center of the spindle to pull off.
That said, if I have super long stemmy crap, I do keep that out of the spreader, but that works out well since 1 bucket of crap hay takes up the space of 2 muck buckets of all the other crap, so I can get everything spread in one trip. The few times I have an extra bucket of hay I just dump it in the woods and spread it. I’m pretty sure as soon as I do that, the asshole horses who couldn’t be bothered to eat it in the stall or dry lot will find it quite delicious. It certainly seems to improve in taste as soon as it gets in the muck bucket…