Throttle slide cable nipples

The throttle nipple has been fitted in this fashion for as long as I can remember without any hint of it coming adrift, crimping only grips it were it touches soldering if done properly all along its inner surface is a much safer option and works every time.
The secret with soldering is to get everything clean and dry. A flux pot( dip components in it for at least 20 seconds) . A solder pot with the solder temperature just simmering at  the point when it is showing a shiny silver and becomes convex with as much bird-caging that you can manage will be enough. 
 

... those little nipples don't give much room for splaying the cable but the ones I've had from Venhill have a small chamfer which allows the cable to be spread to some extent.

These are not 3mm (del-auto are) they are 1/8 inch. I have always found that we bought cables ready made, and never had any issue with dropped nipples.
Further there has been the discussion re twin cables from the handlebar to the carbs or the traditional 1-2 Amal cable joiner/splitter. The former can suffer from low speed misalignment of the two carbs at low speeds, so be aware. While having the twistgrip cable set up the same as the choke cables could be be very handy if you break a throttle cable when out/about.

Is 0.120" approx, only 5 thou less than 1/8". Once you have a bit of solder on them the difference becomes vanishingly small.

Hello Graham,

The method described by Paul works very well. The chamfer Ian was talking about is all you need. Just bird nest the cable, solder as per Paul's instruction and then file the exposed en of the fired away until flush with the nipple.

When making your own throttle cables, it's important to make sure the nipples don't bottom out inside the carburettor before the gas slide does. I.e. then can't be too long.