I needed some jack stands for a diorama I'm going to be working on soon. So popped open Blender and made one real quick. The lock pin has a brim designed onto it to make it easier to print. Just snip it off after you print. As this is quite small it will test the accuracy of your printer quite a bit, but I uploaded a photo of the test print Zolon was kind enough to do for me so you can see it absolutely can be successful. The ring on the stand and pin are so you can tie a piece of thread or wire between them to keep track of the pin.