I am trying to splice a third copper wire to two currently present wires inside the electrical box of my switch I am trying to replace. Most resources online are telling me to use a wire nut to attach the third copper wire but perhaps I am just not skilled enough but I am having major difficulties doing this. The wires seem to be 12 awg solid copper wires and are very difficult to twist and bend in such a tight space.

My question is; Is there an easier way to splice this third copper wire without using a wire nut? I have used special splicers for speaker wire before but those don't seem strong enough for solid copper wires. Thank you.