I'm not sure if this is the right place to put this, but oh well. Can you guys give me some tips on using magnets in my models, like making it to where i could switch between an Ion Cannon and a Railgun on a Tau Hammerhead, or a flamer and a plasma rifle on an XV8? Where should I get the magnets? How should I attach them? Etc. Thanks; just general tips would be appreciated.