Hi there,I hope I am understanding the question. Not all tubes will fit on a wire frame slingshot. My experience has been that the tube has to have an inside diameter of at least 1/8" to fit on a 1/4" wire frame. It will be a tight fit but using alcohol as a lubricant an 1/8" tube will work. You must let the alcohol evaporate several hours before shooting.
1632 and other small tubes will not fit. People have forced 2040 tubes on wire frames but I have not been able to it.
There are other ways to attach smaller tubes and even flatbands to 1/4" wire frames. Here is a link to video showing how I do it.