Razor Scraper Knife

I was inspired to make this because of the LOBOCNC scraper blade holder. It feels real nice in the hand and I have found it use full for opening boxes at work and to odd need to scratch or scrap at something. Works best if retainer parts are printed out of PET-G or something similarly flexible. The retainers need to flex over the detents in the guards to create the nice spring loaded snapping action. Pay special attention to the retainers after printing and note the protrusions count four and two of them are farther to the outside then the other. Make sure they are oriented correctly with the detents in the guards. Also, the retainers do not look different in the pictures but the back one differs in that it has a hex cutout for the nut. I've included the SolidWorks data.