I found me a length of 3/8" brass tubing that looks like it should be perfect for a BP drop tube for .45/70. It measures 36" like many of the commercial drop tubes advertise, but it seems like 3 feet may be a little awkward unless it's sitting on a bench about knee high. 24" seems about "bench-top perfect". Is the extra 12" going to make a big difference? If so, I'll find a workaround. Thanks.