Cartridge storage is such a headache. I resorted to simply reene - clip it on as I mentioned before. I added a 3rd tire and for some months my set up has looked like a leaning tower of pisa. But then everytime I add a cartridge it groans and I was so afraid which cartridge would prove proverbial straw on the camels back. So I decided to spare myself the pain and ordered a base so that I now have 2 sets. A wonderful alternate are those shoe chrome spinners from walmart - http://www.walmart.com/ip/Whitmor-Chrome-Shoe-Spinner/3868465
But the problem is the clips will not move all the way as there is a section/spoke every inch or so. So adding cartridges in case you are nuts like me who has to have in alphabetical order (well I am in no way mrs. clean but just quirky in some ways) then requires constant moving. I have kept mine for Imagine cartridges and glitters.
So my advice if you do not have that many cartridges and are careful with balance and don't overburden and do not mind leaning then go for 3rd tier (no way am I buying that expensive floor model) - else get another base :)
Now a question to you. What is your storage method. Do post about it here and I would love to read and learn
