Helper and 5.5mm spacer to mount springs under the bed on Prusa MK3

This helped me to mount easily the springs under as discussed there: https://shop.prusa3d.com/forum/user-mods-octoprint-enclosures-nozzles--f65/fix-bed-variance-warp-using-flat-springs-t23693-s50.html (Fix bed variance / warp using flat springs).
That springs solved many issues to me. As I didn't manage to print full bed parts on my MK3, I printed those parts on my MK2 thanx to the firmware of 3d-gussner and the hyperfine bed leveling (https://github.com/3d-gussner/Prusa-Firmware/releases). It