Well the only thing I can say bubba is this, If my ole roto-wing gets hit too bad tomorrow, you may be buying a spinning wing decoy sooner then you think.
As to your weight question Heavy Duty: I don't know what size they are. I'm not much into fishing so I can't look at them and tell you the size. I threw the bags away a couple of weeks before the season started so I can't look at that either. And since I gave up most of my bad habits many years ago I no longer own a scale small enough to weigh them. Here is what I can tell you though. They are the oblong, oval/football shaped sinkers. They have a small length of rubber in them that has a bulb on each end. I'm pretty sure this is to get them on the line. I bought two different sizes and found out which one worked by clamping one on each wing and trying it out. Of course I took the rubber thing out first.
The ones I ended up using have the following dimensions. These dimensions are minus the rubber insert. 15/16" long; 7/16"across/dia at the widest point; 5/64"(almost 3/32" - just over 1/16") gap/slot running down the length. I have one on each wing. Once I figured out how much I needed I sanded the paint off the area. I used some 2-part epoxy top afix the weight to the win. Then I painted it to match the wing.
I started with the round split-shot but that didn't seem to work too well. The football shaped weights with the rubber insert came in bigger sizes and allowed me to use only one weight instead of several. Plus with the slot in them already it fit on the wing better without any alterations. You will probably have to test a few different sizes to find one that works on your wings.
Like I said in my previous post. Mine does not stop in the correct position every single time. But it does so often enough that it doesn't bother me. Most importantly it doesn't seem to bother the ducks. IMHO I'd go with as little weight as possible to save the motor bearings. Knowing that accountants control 95% of every engineer's design choices, I can bet the bearings will not hold up to excessive weights on one side of the wings. And it was the Decoy Brain company that suggested using the weights, not the maker of the spinner. Just something to keep in mind when you start altering your spinner. Not much sense in making it work better if it won't last very long.
Good luck. Maybe we'll see you around one of the 'big' lakes. I have a red truck and an old gray Lakeland 16' shallow V with a 50hp Merc and a bunch of shot up decoys. If you see us say hi!
Ya that was a burn in there. I paint all of my decoys. The guys keep complimenting the paint job on my decoys by mistaking them for ducks and shooting them. Well at least I think thats the reason.