Instead of trimming the shaft or taking off the bottom piece of the shift knob, I simply inserted a socket set screw into the shift knob prior to install. It gives just enough space to clear the side of bezel/console when shifting out of park. I used socket set screws, metric M8 x 1.25 x 10mm purchased from our local hardware store. Cost under $2.00 for 2pcs. (only 1 required for this mod, allen keys not included).