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Because of the complicated linkage, there was binding which made it difficult for the pilot to select between tanks. To overcome this binding, a pair of Vice-Grips (yes) was clamped onto the torque-rod. This was the condition of the aircraft when Denver test-flew it, bought it, then flew touch-and-goes to his death. He had been briefed on how to operate the selector switch -- on the ground. He had never attempted to switch tanks in the air.

I didn't realize Denver had two hours or whatever in the plane when this happened. Was also not aware of the tendency to push the rudder while you were trying to switch tanks. My buddy has an RV-9 (two seat side by side) and the selector is on centerline in front of and just below the edge of the seat. Much easier location to reach and also no goofy linkage to have to work against. Seems like a much better plan. In his case the valve is actually in the cockpit iirc, but you could probably remote it to below the floor if you wanted to and leave the handle where it is. And he didn't stick the tanks. What a doofus.

The rudder pedal thing was only on this particular aircraft. The normal Long-EZ has the selector in an easy-to-reach location.

Almost every airplane in the world has the fuel lines routed into the cockpit for the selector switch.

Yep. A classic case of get-there-itis. I saw a documentary on the accident. IIRC, his brother said he was in a hurry to go buzz his buddy Clint Eastwood's house to show off his new 'toy.'

If you'd like to read the full report, see: Adrian Davis Long-EZ, N555JD, Pacific Grove, California, October 12, 1997