If you have some fabrication skills, you can make your own nozzle to fit your JBL bag. For me, it's piece of cake, because I have a lathe and other machine shop items. But if you're handy, determined and patient ........... you can still make a nozzle without shop equipment. It's just going to take some extra effort.
First, the usual material of choice for fabricated nozzles is acetal resin ......... better known as Delrin. You can buy this stuff in various diameters and it's reasonably priced. Most commonly available in black or white and all sorts of diameters, it's usually sold by the foot ......... and a 1" diameter would be around 5 bucks ........ plus shipping. But you can get diameters way larger than you can ever handle.
You'll also need a some drills and a tap. The correct tap for this is a 1/8-27 taper pipe tap. Be sure to get the tapered tap ........... not the straight one.
Cut the Delrin to the length you want. I do not recommend a lot of length. Depending on how your intestines are situated, you could sit on a long nozzle and puncture your colon. Really, 4" of length is pretty much all you need to do the job. Don't be foolish .......... you've been warned.
Delrin is just great stuff to work with ........ fairly hard but easy to cut, machine, sand, and polish. Of course, you'll want to round off the tip. But you can also shape it with a rasp, file, and sandpaper. It would be best to shape the nozzle before you cut it off the piece you bought. This way you can hold the rod in a vise while you shape it. You can then smooth the finished shape with sandpaper. Starting with course, then working down to fine. You'll want to finish up with some 3M wetordry paper, starting with 200 grit and ending with maybe 1500 ........ and absolutely use the 3M with water. At this point you'll have a very smooth satin finish. I find the satin finish best for KY to stick to .......... if the Delrin is polished like a mirror, you can watch the lube just slide right off by itself.
Now you need to drill a hole. You'll have to get a long drill .......... like an aircraft drill. You can find these at your local Ace or big box home improvement stores. 1/8" diameter should fit the bill here. But I'm going to recommend drilling for the tapped hole first, and that requires a letter "R" drill. Don't have one? A 17/32 is close enough.
Drill the 17/32 hole for the tap first, before you drill the 1/8 through hole. If you try to open up the 1/8 hole, the larger drill will most likely try to grab on the soft material. Go in about 3/4" deep with the 17/32 drill first, then finish with the 1/8 drill. If you want to get fancy, you can drill a cross-hole that intersects with the hole going through the center .......... maybe an inch back from the tip. (This is actually a good idea to add because sometimes the tip may bump up against something and the side holes will still allow fluid entry.) Be sure to remove the sharp edge of the holes either with a sharp knife, or just get a larger drill and deburr it by spinning the drill between your fingers.
Be careful tapping the hole. It's tapered for a reason ......... and that's to get a seal with the threads. Tap a few threads, then try to see how its fits onto the JBL . Just tap it deep enough so that it turns snugly when the nozzle is all the way on. If necessary, tap a little deeper and try again.
Good luck.
http://www.mcmaster.com/#standard-acetal-homopolymer-rods/=r0eftj
http://www.walmart.com/ip/21140882?wmlspartner=wlpa&adid=22222222227016784263&wl0=&wl1=g&wl2=c&wl3=35644439796&wl4=&wl5=pla&wl6=50565207156&veh=sem