Alright, just tell me which chuck to buy.

[CHJ]

Type C jaws will allow basic dovetail spigot and socket mounting.

Perhaps the most versatile of any jaws for most turners..

 

[Castanea]

And when you do realise one of the screws has gone missing and a pile of shavings has already been slung in the chicken pen your only hope is a handful of neodymium magnets. I thought my chances where pretty slim but I ran the magnets through the straw a few times and bingo - there was a the screw stuck to them.
As for finding a clear flat surface to change the jaws . . . maybe in someone else's shed but not in mine I'm afraid