Sports Roller for Muscles and Foot Massage (REMIX)

(REMIX) to change from 8mm (metric) to 5/16" (SAE) hardware, the following are needed:

Change number 1-A: the overall length of the threaded section is over 12"; however, the threaded rod sold at home stores is sold in 3 foot lengths, so I wanted to reduce the overall length to 12" so that I could make three sets, rather than 2 and have a 10" left over piece of rod. The easiest way to do this is to print the handles vertically, and then sink them into the bed 7-8mm. The print will be thinne