I wrote:



Some seats are replaceable. Look inside the hole and see if there is
a slot in the ccurrent seat (interrupted by the hole through which the
water goes.) A flat screwdriver removes the seat. But like he says,
only if it feels rough.

I don't know what I was thinking. Replaceable seats have a square
hole in the middle and use a tapered square tool to be removed. I"m
sure the tool is not expensive at all.

When I described the slotted part, I might have been thinking about
carburetor parts.