Greetings folks, I am wanting to change the 40 micron bronze filter in the port block of my Bobcat 642. I read that I need a bobcat tool MEL 1177. From past experience I know at times the special tools required to make repairs can be substituted with tools we already have in the tool box. Can any of you guys tell me if I need this tool or will my left handed monkey wrench do the job ? ? ? Should the filter be changed or can it simply be properly cleaned and reinstalled ? Thanks for your help.... Have fun, buckshot