Do you have the old style blade blocks or the upgraded quick release blocks? Either way you could buy a new upgrade kit to replace the old or upgrade blocks. I have the upgraded blocks on my gray Scroll Saw and blade changes are much easier. See link below.https://www.shopsmith.com/ownersite/catalog/scu_bladeblocks.htm
Mark V 520 S/N 09-11-01 completely upgraded to Mark 7, with all SPT's & more.
Model 10ER S/N R64000 first one I restored on bench w/ Shopsmith metal ends & retractable casters. Has Speed Changer, Model 4E Jointer, Jig Saw with lamp, a complete set of original accessories & much more.
Model 10E S/N 1077 oldest one I have restored. On bench w/ Shopsmith metal ends & retractable casters.