I hope I am not out of line here (The question was asked over on Brian's 1st Horn Of The New Year thread) but this is how I pour a pewter tip on a horn. First I reshape the tip where the pewter will be making a cylinder shape maybe 3/8 to 1/2 wide and maybe 1/2 to 3/4 long, there should be a step from the cylinder to the horn maybe 1/16-3/16, all sizes will depend on what you have to work with. To keep the pewter on take a small half round file and file some little groves in the cylinder maybe 5 or 6 alternating them top and bottom.
Make a slightly tapered dowel, use hard wood, that will fit in the hole in the horn, just a slight taper to make it easier to get the dowel out after pouring. (Large end OUT) I make the dowel about four inches long and leave about 2" sticking out the top of the dam your are going to make. Take a lead pencil and cover the entire dowel with lead, then smoke it up real good over a candle flame. This maybe overkill but it helps in getting the dowel out. It needs to be a TIGHT fit so pewter does not get past it.
Now with the horn shaped and the dowel in make a cylinder of thin cardboard, I use file folder, that will fit around the horn just below the step. The length of the cylinder depends on how much tip you want, make it a little longer than you want , you can always trim it off later. It is easier if you wrap the card board around something that is almost the size of the horn, the cardboard should overlap about 1/4' or so.
Once you have the cylinder made and fit to the horn tape the bottom of the cylinder to the horn tightly, put more wraps of tape than you think you need and press it tightly. While taping the cylinder to the horn try and keep the dowel centered, remember it should be about 2" above the top of the cylinder.
Secure the horn in a vice or cradle of some sort with the lip of the cylinder as level as possible and the dowel centered. Melt more pewter than you think you will need, I use a large stainless serving spoon with the bowl bent up on both sides to form a pouring spout. It helps if you steady your ladle with a stick, kind of like a sign painter uses to rest his hand on.
BE SURE AND WARE SAFETY GLASSES, gloves may not be a bad idea either, make sure the floor beneath the horn is clear and pour away,make it a smooth process, no stops and restarts. Let it cool COMPLETELY, it will make getting the dowel out easier. Tap the end of the stick in a little to get it moving, it may take some work but it will come out. If it doesn't you can carefully dill it out but I have never had to.
You can shape the tip with rasp, file, scraper or a knife and sandpaper. Use some Super Blue to color it, put it on let it sit, rub it down with 0000 steel wool and repeat, maybe 5 or 6 times, then put some paste wax on it, it will darken up more once the wax is on.
This process will give a smooth transition from tip to horn. If you want a step the horn can be wrapped with tape and the cone taped to the wraps of tape.
I am sure there are other ways to do it but this one has worked for me. If something doesn't make sense let me know and I will try and make it clearer.
Tim C.
PS: Over in the Tutorials there is a write up on making a separate pewter tip.TC