>>7717243>So, this set appears to use a technic axle-pin to connect to a modified 1 by 1 for the robot, is this a legal connection?They've been using it at least since 1990. The M-tron Particle Ionizer uses it in the 'rotor' section. The "Brick, Modified 1 x 1 with Studs on 4 Sides" actually has enough room inside to accomodate a pin, because of the tiny holes in the studs on the sides.