Good to know that@jmudrick. Interesting, So guys who like a aggressive shave could take the spine off and make their bump free Gem razor a touch more aggressive in theory. Has any one done that procedure of removing the spine making for a aggressive shave?? A person could also tame a Gem open comb razor in theory by elevating a open comb with the bumps by placing a thin narrow magnetic strip on the blade so it straddles the bumps(lifting the back of the blade higher). Wonder if any one has tried that procedure to tame some aggression and to smooth it out a little? When I get my Gems they will be tested for different shaves with shim variations and like always any new razor gets shimmed regardless. The bumps are basically shims IMO but some guys hate shims and will not use them regardless and most of the time there is no need I have found.