Way oil gun

What is wrong with those cheap looking plastic pump bottles? Do they not work on grease zerks? Do they leak, or not quite fit?
 
I have one of the little plastic pumps H&M sells. I had really old fittings on my mill, and they were clogged with grease. So I replaced them with some from the local auto parts place. The little pump doesn't seal against them. I suspect it would work fine on the stock fittings, but those are fairly expensive and I didn't feel like replacing them. The up side would be that it would be a lot easier to use, so I might get around to it one of these days. :)

I made a similar pump from a grease gun. Other than being a bit tricky to remove from the fitting sometimes, it works well. I went ghetto and used JB Weld to seal the cap where the plunger went through it. It works surprisingly well.
 
What is wrong with those cheap looking plastic pump bottles? Do they not work on grease zerks? Do they leak, or not quite fit?
I figured I'd eventually drop it, and I doubt that the plastic would fair very well.
 
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