I get my butcher to bone out a shank and especially giving me the ball joint.  he cuts all the bones up for me.  then i roast the bones and some shank meat and veggies (carrots, onions, celery, leeks, whatever) in the oven for an hour or so at 425.  Then I put  it all  in one or two pots depending on how much I have.  I pour a little AVC or white wine vinegar on it, and fill the pot(s) with water.  I put them in the oven and cook them at 200 degrees for 24-48 hours.  I might, if I'm feeling like it, skim the stock from time to time and add some fresh herbs, but either way it's good.  When I'm done cooking I pull out the meat bones and veggies, give to chickens in the yard, and chill the liquid.  Then I put the stock in the fridge overnight until the  fat solidifies at the top.  I take the fat off, melt it and pour it into a jar for frying food or making pastry.  I heat the stock a little because it usually gels enough that I can't pour it. When you get to the bottom of the pot there will be some sediment tha tyou can filter with a cloth napkin or cheesecloth. I pour it into a fat separator and then pour it into silicone muffin molds, freeze them, and dump them into a freezer bags for easy use later. Â
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THe oven is way easier than stove top and I can do more at once than the crock pot.Â