I get my magnets at a craft story. They are cheaper and much stronger than the ones at the local Radio Shack. Just get the extra strong ones. They also sell some magnets that will amost support their own weight The small ones even hold the canopy of my E3D during knife edge manovers and such. The canopy is rather large as it is also the battery hatch. Lots of reports of guys loosing their canopys w/ the radio shack magnets.