Update 7-21-11: Improved Stealth Force Mode, post 13 For a while I wanted to get RotF leader Optimus Prime to hold Mech Tech weapons. I considered drilling a round hole into his fists, but was afraid it would hurt his ability to hold Jetfire's gun. Last night I thought of some quick adapters that do the job pretty well. All you need are a couple Lego Technic pieces per hand. Here's a pic of the pieces along with them assembled on HA Backfire: The gray pieces I used have three holes in them. More or less should suffice, as long as there are at least two: one for the weapons peg and another for the blue Lego piece. I actually had a longer piece that I cut with a pair of flush cutters to get down to three holes. The blue pieces are pegs with one round end and a + shape for the other end. Here's how they assemble in Prime's hand: The + end of the peg goes right in Prime's hand. Both that and the weapon peg going into the Lego hole are really tight fits, tighter than the fit of the Lego pieces. It might also work to use a Lego peg with both round ends, and squish one end with a pliers or something so it will fit in Prime's hand... If you'd like to store the pieces when not in use, you can put them together like this: Then put them in Prime's back like this: Prime's back won't fold all the way down, though... It's easier to store them in vehicle mode, one on each side: UPDATE: I figured out how to use these adapters to give Prime a Stealth Force mode!