Simple J-Head/Groove Mount for Rostock

This is a simple J-Head/groove mount for a Rostock platform and pneumatic fittings. The uploaded STLs are for 5 mm pneumatic fittings but this can be customized in Customizer. Many of the settings available in Customizer don't need to be (and probably shouldn't be) changed, just update "Pneumatic Fitting Drill Diameter" and "Pneumatic Fitting Thread Length" to the appropriate size.

I had initially used and uploaded a variation of mattschoenholz's J-Head mount, however I found that it was unne