Cut a wee notch with a hacksaw at your desired height, hey presto!!
I would sand paint off in a small ring at desired height. Masking tape to get a clean edge. Do the same for second (shorter) user if you like but it will be visible when taller rider is riding
Cost: 0.2p's worth of masking tape and sandpaper
@jj72 started
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Cut a wee notch with a hacksaw at your desired height, hey presto!!