I only used the magnet stored blade for when we were reclaiming tape reels. So much easier to just slice through worn tape on a reel rather than unspooling it. The first time I did it I unspooled about an hours worth of tape and filled the small office bin and then some. A lot more fun to do it that way but far messier.
Otherwise I had a bit of bluetack and a oil paper holder (to prevent rust) stuck to my the other side of the drawer tray.