How to use MagnetsCompiled by Shas'El Tael.The most popular and powerful smale scale magnets are neodymium magnet or NIB magnet (also known as a rare-earth magnet). They are very well suited for modelling weapon fits and modular vehicle attachments.
Neodymium magnets; 1.5x1mm] and 3x2mm.When shopping for NIB magnets the best way to go is online for sheer variety :
Aussie magnetsAustralian Small Magnet Supplier
KJMagneticsUSA based Small Magnet Supplier
Amazing MagnetsUSA Magnet Supplier, fast and great customer service.
GaussboysUSA based Small Magnet Supplier
e-Hobby ToolsSupplier of various hobby needs
Power MagnetsUK-based small magnets supplier
Adding magnets to your models
Hand Drill and bits; 3mm, 1mm and 0.5mm.Hand Drills are the most popular way to drill holes for placing magnets in. Utilising 3mm, 2mm, 1mm and 0.5mm drill bits. These will make snug fits for equal sized disc magnets.
Various suggested placements for 3mm and 2.5mm magnets in Tau Battlesuits.When drilling plastic models, for example 3mm magnets, drill a small pilot hole using a 1 to 1.5mm drill bit, then drill your main hole with the appropriate sized bit (eg. 3mm for a 3mm wide magnet). Typical drill bits will have to go deeper than 1mm at the centerpoint to create the 1mm deep divot you need to place the magnet in. (I use the rasping handle end of a GW needle file to bore out the base of the divot, it is 3mm in diameter ~ Tael.)
Keeping the hole depth uniformOnce you have drilled the first hole to the correct depth, mark the drill bit with a permanent marker or If you don't want to mark your drill bit just wrap some masking tape around the bit. Then every hole you drill after the 1st you just drill down to the tape/mark.
Suggested magnet placements under the devilfish hull for seeker missile attachment and doors and frames of the hull.An online and reputed source of hobby tools (such as hand-drills + bits and Needle files):
e-Hobby ToolsSupplier of various hobby needs
MicromarkA selection of small tools and reasonable shipping. Also stock the miter box and a number of useful miter contraptions.
Cleaning up rough holes and hiding magnetsWhen you have glued in place every magnet, cleaning up rough drilling edges, or the desire to complete hide the magnet can be done with Green Stuff epoxy putty for example.
You can source epoxy putty online here :
Supplier of MagisculptAlternate epoxy putty to 'GreenStuff'
Polymeric SystemsThe makers of the epoxy putty 'GreenStuff'
Secure WeaponsIf you wish to make secure fittings, to stop weapons spinning around one magnet, Pshar's Rifles proposed this idea;

"The nice thing is, I can flip the weapon down to take up less space, but when I lift it into position, the second small magnet pops it right into alignment. You could do this with two of the same size magnets, or a tab, but I liked how the connection looked with two different sizes. Sort of like an adjustable hydraulic mount or some such. Without a "tab" of any kind, there's nothing to break if you accidentally torque the weapon (or the mini falls off a terrain piece).
Some folks on ATT like
GaussBoys. I'm a
KJMagnetics fan. They even sent me a package of random small rare-earth magnets of various shapes for free"
In Depth Tutorials using magnets with Tau VehiclesPiranha Magnets Tutorial
View Here.Detailed Devilfish Tutorial
Download Here.Detailed Hammerhead Tutorial
Download Here.In Depth Tutorials using magnets with non-Tau VehiclesBudget Minded Predator