What to look for in a older tedder

I am starting to look at older used tedder and i have never used one before and was wondering what I should be looking at As far as issues and wear. I would like a 4 basket manual fold. I have found a few Walton 4 basket tedder in my price range and was wondering if they are any good and if parts are still available? I will only be using it over less then 50 ac a year so not wanting to spent to much. Thanks.

What to look for in a older tedder