David and I have put together a video on dipping cab mandrels and using them with M25 nuts for ring toppers and pendants- you can see it here :) obviously the dipping applies to all cab mandrels but ours have been designed now to accommodate the nut over the center pin - enjoy :)
http://youtu.be/zzlXFYIKatU
That's useful to see, (similar to how I've done it in the past) but a few good tips.
Thank you Manda for sharing.