I am new to this so I am not sure if this is the right place or not but here is my question. Are there other body tubes from other brands like ultrafire or others that are interchangeable with the pd20 or the pd30 heads? I am looking for single rcr123 body tubes. I am hoping to find something cheap. I have a pd30 but would like to find a cheap 1x rcr123 body and tailcap that I could use with it. Thanks