Cartridge Cap Modified to allow differing O rings

Adapted from the original excellent file from 'The Sealant Cartridge Nozzle Cap That works. by The-Mechanic'
Published on January 23, 2019 www.thingiverse.com/thing:3375441

I modified this as the O ring in the original was not readily available in the UK
The Fusion 360 file allows you to alter the O ring size in Modify - Change Parameters from the menu bar in Fusion 360 see graphic in file list

The thread is 9/16 UNC to fit cartridges in the UK and probably elsewhere, again this can be m