Hoover Twin Tub Parts
Though perhaps hard to come by, are not so rare. Production was only halted quite recently in the UK that MIB parts can still be found with some effort. Even in the United States, if one knows where to look and or keeps one's eyes peeled,parts do turn up.
Weakest link in Hoover TT's appears to be the pump, again, they can be hard to find, or you will be tripping over them, depending upon what mood the gods are in. Was quite blessed to have a member send a pump from Oz, to replace the knackered one in my machine. However later found one, then another NIB pump, so am setting pretty pump wise.
Hoover in the United States probably stopped making their portable washers and dryers as the market for semi-automatic, wringer and such machines decreased as more housewives and others moved to fully automatic washing machines. Even the portable washer and dryer market soon had fully automatic offerings by GE,Kenmore,and Whirlpool.
Twin tub washing was really a bridge niche, or variation if you will from wringer washing machines. But still, if one gets in the mood, one can easily run though a mountain of laundry quite fast in a twin tub, versus a normal washing machine.
Of course the easy solution, provided one has the space, is to purchase a second Hoover washer to use for donor parts. There is a posting from a member about NIB twintub washers for sale.