The file 'G29 Shifter Support Knob 3D Printer Model' is (stl) file type, size is 315.0KB.
There's one that uses an M3 nut & bolt,
but if you don't have hardware I made one that is a whole unit you can print, laying flat so you dont have to worry about supports. i recommend this.
also made a cap thang.
grid infill on cap will probably be best for it
enjoy
g29_flat_print_knob_threads.stl | 907.3KB | |
G29_thread_knob.stl | 183.9KB | |
g29_top_piece_thang.stl | 114.4KB |