Difference between solid roller and flat tappet

yellow rose said

Too bad you can’t get mushroom lifters any more. I’d do that in a heartbeat if I can get them.

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I used to resurface those, back when I was working... sadly, I don't have access to that anymore.
There used to be a local shop (to me) that could do it but, it's changed hands since.
Now if you ask a shop, they look at you like you're asking for a unicorn !