Was about to get a toy- then I did some research...

[AndyUK]

I always have difficulty judging sizes from pictures. Usually have to get my callipers out.

They look like GX16?

The spindle will take a GX20.

I've been soldering lots of 7-pin GX16s and 4-pin GX20s this weekend.

Tip number 1: Get someone to help hold stuff. Failing that, grab a vise or something. And like ten of those helping hands things.
My technique (who knows if its good, but it seems to work). Tin the wires. Prep the pin with a decent amount of solder. Then flow it whilst simultaneously heating the wire, and bring the two together asap. Reflow once you're happy its in a good place to avoid a cold joint. Can be a real PITA when you're dealing with very short cable ends to keep it looking tidy.

Oh and DON'T forget to put everything on the right side of the damn panel. Spot the error below...