Square neck carriage bolt Knob

I made a Square neck carriage bolt Knob to secure the car jack to the provided attachement next to the spare wheel. I used a 5mm Square neck carriage bolts (~65mm) and a clip on spacer to keep the knob above the uneven parts of the Jack.

The Jack handle is in two parts. The longer loose fitting part is kept in place with Part 2 that fits snug on the handle. This is to keep the handle from ratteling when in storage and to assist when using the jack as a more comfortable handle.