Its tight as others have said. But thats a lot better than being loose. You can sand/file it down a little to get what you need out of it. You are not going to add material likely to make it fit more tightly though, unless maybe you are certified electrical technician. A lot of saber building is improvising and being creative. If you need wires to pass through, there is still room to just drill some wire sized holes i the upper or side sections of the piece. I haven't had any trouble with these in the few sets I've used. So much more time spent cutting spacers/all thread, and getting tiny nuts to thread up than on any modifications to the discs themselves. I won't build without these anymore.