On Tuesday, in article
"Tony Williams" wrote:

Years ago the approved way of jointing two thick
wires was to hold them parallel and tightly wind
onto them a 'spring' of about 26swg tinned copper
wire. Then solder together. The spring provided
the mechanical strength, and avoided the need to
twist (and possibly weaken) the thick wires.
Tidier for sleeving as well.

Errm, by 'spring' do you mean helix?

(There's nothing springlike about BTC)

--
Brian {Hamilton Kelly}
"Je n'ai fait celle-ci plus longue que parce que je n'ai pas eu
le loisir de la faire plus courte."
Blaise Pascal, /Lettres Provinciales/, 1657