Sorry, can't really help you with the quality of current blow-ups, haven't seen one in person since I was a teenager (a long time ago...)
As far as the state your perticular one is in, sounds like it was second hand at best, hence missing parts, damage etc.
Best I think you can hope for at this point is asking around those website if they have or know where to get and insert.
As for repairs, trial and error on finding all the leaks I'm afraid. Then patching them up... stinks I know.
Avoid random sellers on ebay/Amazon/Alibaba etc.
Wish I could help more. Good luck though.
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