The "pull" throttle cable on my 350/4 recently snapped. I went to David Silver Spares & discovered that the part is "No Longer Available" from Honda. Crap! I have previously made throttle cables for my Morini 3 1/2 Sport, so I decided that was the way to go. I have perfectly good outers, I just need new inners. The only problem I could see was the nipples. The Honda ones appear to be made of some sort of aluminum alloy. I snipped the nipples off an old cable, and drilled out the wires. It worked okay, but I wasn't entirely happy with the result. What I needed was some solid brass ones...
I searched the aisles of my local "Bunnings Warehouse", and I came up with the perfect item:

This is the part I paid $9.50 for. It's good for 4 nipples:

I sawed off a "blank" with a fine hacksaw, then I was left with finding a solution to the uneven cut. This is how I got around that issue:

I mounted the blank in my pillar drill, a medium file in my vice, and I soon had beautiful even ends. I then drilled a 2mm hole, and countersunk with a 5.5mm drill. This is the finished product:

Now all I need is the inner cable I've ordered from Venhill...