Had a friend help me fabricate the piece that I'll use to lock the input shaft of the transmission.

The splines are from the center piece of a clutch for an old Toyota Celica. It's a 21-tooth 28mm diameter spline. A google search of the spline dimensions brought up the clutch alignment tool for a 70's Celica. You could probably go backward from the clutch alignment tool to find other cars with the same spline. Apparently Toyota used the same size splines on several other vehicles including the Rav4. I find itquite amusing that the clutch from an old Toyota fits perfectly on the input shaft of a 2007 Lexus Hybrid.

The clutch hub was welded to a piece of 3" exhaust pipe which was then welded to a circular plate. I'll drill holes in the plate this weekend and bolt it to a sheet of 6mm aluminum which will also bolt to the bellhousing to lock the shaft from spinning.

All up, it cost me about $30 plus dinner for my friend for the welding and some scrap steel he had laying around.