any monkies use chain tugs on their bikes with horizontal dropouts? i have 1 of the spot rocketship tentioners, but its all i can fit on my bike. i think i need a wider axel to run two of them. do they help secure the wheel that much more than just a regualr QR? i'm afraid of the axel slipping when doing a drop or hopping around on the rear wheel, anyone heard of this happening?