66 Mooney M20E Fuel Selctor - Poor design
Was on the floor just about a foot from the rudder pedals. "Seasoned" guys with a gut (like me) would have to unbuckle, slide the seat back to get to it. Also, to switch tanks, you'd go thru the "off" position!
Many folks built a tool - sort of a "T" handle with prongs to move the lever, avoiding the unbuckle, slide seat dance. I was wary, as I felt I would lose the tactile feel of the L-OFF-R detents.
The POH (all 20 pages) called for 1 hour on one tank, switch and run the other tank dry, then switch back.