And the saga continues. I was thinking about installing zerks in my balljoints (sounds painful), so I began by disassembling a scrap example.

The balljoint is pretty simple. The shell and ball are the major components. The ball sits in a nylon grease cup. Below the grease cup is a rubber spacer, and then a steel cap. The cap is crimped into place. The crimps are super heavy duty, but no match for a cold chisel and a 3lb hammer.

My conclusion: it's not possible to install a zerk. Drilling through the steel bottom cap is simple enough, and the nylon cup has a hole and grease grooves which should make it simple. But the dense rubber plug seals the hole in the nylon cup. Unless you somehow manage to clear out a donut hole, it's not going to work.

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