Summary

dam i am good hear it is the 50mm micro shock i did find one click pin that i did not steal the spring out of for other uses unfortunately you can not just buy these springs i have done extensive search for these springs and the only place that sells these in bulk is in China in 50 piece lots

https://www.ebay.com/itm/New-style-50pcs-spring-spare-ball-pen-part-424/142761746310?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

i have ordered a bunch of these as i use pen springs for a lot of projects they are extremely useful

so you will probably have all your coworkers wife and husband pissed off at you for stealing the springs out of all of their pens