Having trouble finding the right screws to make other GoPro thumbscrews work? I found stainless steel machine screws M5-0.8 x 40mm on Amazon, but they were too big at the head to work, so I started from scratch to design these thumbscrews. The 25mm design is more like the OEM thumb screw, the 29mm design gives a little more length but uses the same screw. Also included 123D source files in the zip. Find the screws on Amazon here (pack of 25 was $5.45 as of today): http://www.amazon.com/Stainless-Machine-Finish-Phillips-Threads/dp/B000FN7X3O/ref=sr_1_1?ie=UTF8&qid=1413227279&sr=8-1&keywords=phillips+flat+head+machine+screw+5mm+40mmMeasured the OEM item. Designed in Autodesk 123D and printed on Maker's Tool Works Fusematic. Printed at 0.15 layer height in ABS. Needed raft to be successful for print. If the screws are little loose, just add a drop of hot glue and drop in the hole.