I have the buttons at the top. I can easily do as you suggest - a short ride with the tunnel cover off and see what happens.
What about the option of just buying new valves? I know absolutely nothing about rebuilding them nor where I'd even take them to have it done.
One other thing...I assume they just unscrew (right threaded?) I briefly tried to turn them (just to see if loose) and they won't budge either way. I didn't apply much force but have a socket that fits on them.
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