1 - NEMA23 Motor (preferably with double shaft) 4 - M5 x 35mm bolts 4 - M5 locknuts 1 - M5 thumbturn for allen head 1 - 608 skate bearing 1- 8mm x18mm metal shaft 1 - 1/4" x 1.25" spring 1 - Hobbed Pulley (http://www.reprapdiscount.com/mechanics/52-hobbed-pulley.html#/bore_length_diameter_hob_diameter-5mm_11mm_12mm_10_1mm) 1 - 1/8" NPT quick connect fitting and thin 1/8" NPT nut or 1 - M8 male screw to 4mm compression fitting (http://www.amazon.com/Legris-Compression-Fitting-Adaptor-Metric/dp/B009PSSNXE?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s03) and 1 - thin M8 nut