Growing spinach for saving seed

Hello all,
Looking for some advice from anyone who has saved seed from spinach. I am going to be attempting it this year and was looking for anyone who might offer advice.
I am not looking for seed purity as I want as much cross breeding as possible. Anyone got any advice or tips/tricks to it?

Spinach has different male - female plants. Meaning you could cut off male / female flowers before they open if you desired from certain varieties.
Bloomsdale apparently self pollinates.

I've had great success letting Gurney's Goliath spinach go to seed.
Was nothing to it really, I just left it alone after it bolted and it did the rest.

I saved spinach seed last year for the first time, and yep, it was easy. It took longer than I'd expected, considering how eagerly spinach can bolt sometimes. The plants were ultimately quite big, so it needs more space than when you're planting just for eating. Of course you can plant closer together, thin and eat, and leave some spaced out to go to seed. The seeds are very spiky (I think I heard somewhere that smooth leaved spinach makes spiky seeds and savoyed tends to make smoother seeds). From a little patch of about 1x3 or 2x3 feet, I got a large cup of seeds, which will last me for several years if I don't give it all away. A lot also fell around and self seeded, which was fine.

To clean the seeds, this worked well for me. I dumped the rough seeds and chaff in a big sieve and stirred and pressed it with a stone, mortar and pestle style. Most of the chaff broke up small and fell through, and I picked stems off the top, and the ended up with fairly clean seed.