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Alright so I'm working on a revanite titan for a friend of mine and I have the model mostly finished in its pose. but the I magnetized the arms to come off for transport but the magnets I'm using are not holding the position I'm looking for. They just spin to the downward angle under the weight of the arms. Now in the body I have a large magnet that the owner put in but I use smaller magnets (still powerful just easier to hide). anyone got an ideas? I was thinking I might have to go to a more powerful magnet but I figured i would ask before tearing him down.

It would help to know what size magnets your using but it sounds like you either need a stronger single magnet, a second magnet (2 placed next to each other, if there is room) or use the one you have and add a small pin on the body and a hole on the arm or vice versa, the magnet will hold the arm on and the pin will stop the spinning.

Two magnets next to each other would work.

I though if this a while back when i was planning a project, and decided to do one magent about .5mm to the left from the centre of the arm and another .5mm to the right of the centre. That gives 2 magnets, 1cm away from each other, which will hold the arm at the right angle.
That is the solution i came to using the 2mmx1mm magnets i have.

hope that helps

Put a drop of pva glue on the each magnet, and let dry (separated, not together).

The glue will increase the surface friction on the magnet, allowing for them to not slide as much. Also, using stronger/bigger magnets helps too.

I have even seen tiny bits of sandpaper glued on to increase the friction as well.
best of luck.

Two magnets or a magnet and pin works. One magnet tends not to.

I have metal dreadnought arms magnetised (the dreadnoughts themselves have washers on the arm mounts, around the mounting pin).

One magnet while strong enough to hold it on, was not enough to hold it in place and stop it dropping. TWO (opposite sides) were.

Tried it again with the plastic DCCW arm, just to see if it wasn't just the weight of the metal arm that required it.

It also required TWO magnets (same procedure) to stop it dropping. It's all to do with off-centre mass and leverage.