The other posts about the nodes being different are correct - while in theory all nodes should fit into a 12mm hole, after you work with a lot of different vendor pixels you come to find that nodes differer in diameter, materials (soft to stiff) and even the space between the "fingers" that grap onto the material. The material in this item is ABS but due to some of these issues with ABS and it's rigidity, we are going to be switching back to HDPE for all but a few items since it is a bit more forgiving for node installation.
I wish there were standards that we as manufacturers could follow but there just are not any and this sometimes makes it hard for us to meet every requirement customers may have for these types of products.
Thank you,
David
HolidayCoro.com