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@welpeur
tapping the cartridges out of the primato is a bitch as r cheese said .. i knocked the corners off several screwdrivers before my g/f found that using a pitlock skewer worked .. they are good for something at least!
word of caution .. when inserting the new cartridges make sure that the pressure is applied to the outer race .. if you apply the pressure to the inner race you'll pit the bearings immediately (i've done it) .. my solution was to pick up some appropriately size washers from the hardware store and then place them on the axle on each side outside the cartridges and then just use track nuts to tighten both in at same time .. works a treat but one other word of caution if you do this .. use either steel washers or multiple washers as one cheapo washer buckles under the pressure required to insert the cartridge and hence applies the force to the inner race