MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
I just found a spring that seems to work .The notebook with a plastic spiral from wmart called the Neon nights collection $1.97 and one book is plenty .I think there is yellow and black .I took 5 winding's and bent the ends level and that gives it just enough to hold the valves shut. The dia.is perfect and plenty soft . Hope this may help