More of an accessory to the Caps for RGG360 Miniature Handle by @Lichtjaeger, this sockets into the bottom of the arm caps to help break the merged rotating arm from any tolerance stickiness.

Either use the tabs on either side to twist, or for those more stubborn prints, use a rod (phillips screwdriver from my Prusa kits in my case) in the center hole to gain leverage.

Print with strength in mind.  On Bambu X1C, choose the 0.2mm Strength setting for layer height (6 walls, 25% infill).