I personally always use disc magnets. They've worked fine for me. Be sure your getting N52 neodymium magnets. Same ones used for Warhammer. I generally get mine on evil bay from an Australian company due to price. They are what held the sculpted arms in my Absorbing Man. Most of those arms ended up quite heavy. Hardest part was getting them apart. Even the tiny ones are string and when stuck together can be a pain. N52 is the strongest grade that can be shipped I believe and you need a special license of some sort to own a larger one I've heard. Great stuff. Hope that helps!