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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?
Cannon
 

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Some things just aren't worth the time to try and get out. Usually the zerks are soft metal. I'd drill them out and either buy a couple of straight push-fit fittings or thread the hole and buy proper size zerk. If you drill, slather some grease on the bit and it will keep the chips stuck to the bit. You'll find the push-fit fitting at Graingers, Fastenal and probably farm stores. Maybe auto parts but most of those I've seen are threaded.
MikeC
 
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