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Originally Posted by White951
I 've never heard of this. I figured i could have pierced the boot and injected some grease but then there is a hole that water dirt and salt can get into. I don't get how a zirk fitting can just rest in the rubber. If I were to try and put more grease in at a later time wouldn't it just push the fitting into the boot and then I would definitely have a whole in the boot. How does the fitting stay attached to the boot?
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The zerk fitting is on the needle and comes out when you pull the needle out. The hole made by the needle is so small (no material is removed) that it effectively seals up as soon as the needle is withdrawn.
Wholey zirk!!