For those technians that won't settle for simply one loadout for the mech(s) and/or vehicle(s) under their care! These are the sizes of magnets I use when designing the majority of my modular elements.
Small Size - 1/16th x 1/16th disc magnets.
Use for a large range of applications, including assorted torso and weapon plugs, very flexible but best plan for direct magnet to magnet contact for larger or heavier parts for the best results.
Medium Size - 1/8th x 1/16th disc Magnets
I use these primarily for hip-to-torso connections. The larger size makes for a strong hold that can handle picking up the whole model by the torso and not freely spin for accurately indicating a Mech's facing where applicable. I also use these in bases for making the mech completely removable from the base.