https://www.amazon.com.au/XP-Pen-Star05-Wireless-Graphics-Battery-free/dp/B01MAZ5FDL With the advancement of tablet technology, artists no longer have to decide between a drawing tablet and...
Building instructions:
http://www.instructables.com/id/Nerf-...
The stronger spring:
http://www.orangemodworks.com/product...
Sentry gun project by Bob Rudolph:
http://projectsentrygun.rudolphlabs.com/