The only problem with this is that the pins in the MMC range can become loose so repeated removing and replacing is not a good idea. The last of the ones available seem to suffer from this in particular. It is clearly a design problem to do with having to wiggle the cartridges in and out as I have heard of some of the Soundsmith cartridges suffering the same problem. However in their case, Soundsmith offer a warranty on their new cartridges so are a better bet if looking for a replacement. The MMC20/MMCX000 range does not suffer nearly so much with this problem - the only fault I have seen a number of times on these is the stylus guard falling off.