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Not early, late. I'm in South Korea.😄 Even if we could fix the recurring issue I don't think it's worth it anymore. They aren't hard to fix and it also forces people to change o-rings that need to be changed anyway. And I honestly don't think these pumps and engines will be around in vast...

If the plunger isn't sticking at all and the spring isn't weak, there's no reason the button would fall off, even with a failed retainer. The plunger, button, tappet and cam will all be in constant contact, and being as the plunger and button have concave and convex contact surfaces the button...

Nah James, you might be surprised to know I've had quite a few trucks where I've found the button and clip fallen off when I'm just doing hydraulic head o-rings on an otherwise good running truck. I'm inclined to think this is a compound issue of failed button retainers and tolerance stacking...

That was the problem. It didn't need a new head. If you had just reinstalled the button it would've been fine.

This^^. Or you could have a worn drive cam or tappet in the pump center section causing a reduced length of plunger stroke. The button or top of tappet could also be worn but that's exceedingly rare.