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@Weslito
Freddie, these will not do what you're trying to do.
They are merely designed to keep the wheel in position in the dropout if the bolt comes loose. They are not engineered to bear any load.
The way you're looking to use them, in the event of the wheel slipping your entire weight would be suspended on those little tabs, which I imagine would fail very painfully. Someone said on here once, and this is very wise advice: Thou shalt not fuck with that which is load bearing.
What I can recommend however, is making a spacer by snipping off a small piece of spoke, (or you could use a ball bearing from an old headset or something) and placing it in the dropout. Put a little blob of blue tack on the back to help stop it rolling out while you're installing the wheel. Then just drop the wheel on top, make sure it's sitting snugly on the spacer so it won't roll around, and tighten it up like a beast.
The spacer doesn't actually need to support very much weight, but having your axle suspended in the dropouts will likely result in slippage, so it's just there to assist the bolts do their job. I've been riding on this myself for a while and it's rock solid.