11320 Kirjes-Guinevere Hand Pump

The sander actually becomes flat when pressed against a flat surface and round when pressed against a round surface i.e. the sanders conform to the underlying surface. Consequently the sanders should be filled with very little air.  The #140 Drum has a 1 5/8" Diameter and is 1 5/8" long with a 1/4" Dia Shaft.

The sander actually becomes flat when pressed against a flat surface and round when pressed against a round surface i.e. the sanders conform to the underlying surface. Consequently the sanders should be filled with very little air.  The #120 Drum has a 3/4" Diameter and is 1" long with a 1/4" Diameter Shaft.