Lock top and stop
thingiverse
You can snap this onto the lock to prevent the pins from falling off. There is also one that prevents the pins from falling out and prevents the cylinder from sliding out. Adding these will also make it more fun to pick :)
Download Model from thingiverse
With this file you will be able to print Lock top and stop with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Lock top and stop.