I'm new here, and I'm taking a risk by posting this in the ground support rather than beginner section. I have read many threads on here with great but sometimes conflicting information about launch rail selection. I have seen threads with great images of the various profiles, including this awesome image created by terryg. In the image, it appears the "micro" button is quite tight in the Makerbeam slot. There are threads in which users have even reported that the early micro buttons from rail-buttons.com had a tendency to snag in the Makerbeam rail. But all those posts are fairly old, and my question is whether this got sorted out at some point. For my 13mm and 18mm motor rockets, is the micro button from rail-buttons.com a good solution when paired with the 10mm x 10mm Makerbeam? I would avoid the problem altogether by getting a 15mm rail, but I fear I will have problems flying 4 fin 13mm rockets from the 15mm rail. In fact, if someone can verify that a 4 fin 13mm body tube rocket with a micro button will fly off a 15mm rail, I will avoid the "which rail should I get?" issue altogether by simply getting the larger rail.