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Exactly which magnets do I need for the arms and airspace weapons? And where would the best site to go for them be in the USA?

I love K&J: http://www.kjmagnetics.com/

Also BoLS just a did an article on this topic. I don't like how they did the actual gun barrel part but it's all pretty useful to view: http://www.belloflostsouls.net/2016/05/hobby-hacks-making-your-knight-titan-interchangable.html

What I've always done with my nid stuff and other stuff I'm adding magnets to... use my drill bits to figure out size; once you can eyeball a good match, order that size from K&J, they can do American Standard or Metric. ...then obviously use same drill bit to make the hole for it hah.

Having just magnetised a couple of Knights last week, and doing the same to a Reaver today, one tip I highly recommend is to place a layer of green stuff/putty over the magnet, prevents any damage when they attract as there's a chance they could shatter.

There is a post right here in the tutorials.

http://www.dakkadakka.com/dakkaforum/posts/list/651017.page#7938248