Parametric Spool Hub Remix

This is a remix of thing http://www.thingiverse.com/thing:605360 .. The design is brilliant however I did not require or need to use a bearing but I did need to increase the threaded spool diameter opening so I could pass my factory spool holder rod (CraftBot 18mm diameter). The code changes only the original bearing radius and threaded rod code and it now allows you to change that via a slider. This is my first SCAD/customizer object.