My late FIL had this disk when I married into the family 36 years ago. I need to use it to go over a few acres we had a bulldozer on so I was going to grease it. I got 6 of the 8 fittings to take grease but 2 of the fittings are broken off. I can't find any hex that would indicate that they are threaded in so I assume they are driven in. Anybody have a magic trick to get these out?
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