For historical purposes it is nice to have the Model 10 lower blade guard but as a practical part to use, it scores pretty low, just above not having anything there. A better Lower Blade Guard that fits the Model 10's is the one for the Mark 5/V shown below and in my earlier post in this thread. Using the Upper and Lower Guards (505627 & 505628) together reduces alignment time if you keep them attached to each other. I would use the 5/8" Arbor with the machined washer next to the base, then the blade, the wide spacer and lastly the nut (see 2nd pic below). This moves the blade closer to the quill and keeps it from hitting the far side of the lower guard. Although, for safety, I use the later Arbor with the keyed washer instead of the original Model 10 version shown without it. You can use just the Lower Blade Guard 505628 with the Model 10 Upper Guard. Either way you add dust collection to your Model 10. even though the Mark 5/V Guard set was made for a 10" blade stay with the 8" blade since that is what the Model 10 Table was designed to use.
Mark V completely upgraded to Mark 7
Mark V 520
All SPT's & 2 Power Stations
Model 10ER S/N R64000 first one I restored on bench w/ 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/ metal ends & retractable casters.