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With the new sticking charm, just falling off is fairly rare in my day. But as a Seeker, a good Wronski Feint with have the bloke on the other team augering in. Other than that, it's the mid-airs and clipping a ring that will break something. Or a Bludger to the head, of course.
You know, I enchanted one of those on a wager once. It was absolutely horrible, but I did get it off the ground... Briefly, anyway.
All the better a skill test then. Won't be any time constraints; that wouldn't be fair if you're never done it before. If you'd prefer, I can send one around now, give you a few days to work on things, do a little cautious flight testing maybe. If you know enough to tune the spellwork, you should know enough to do the spells from scratch - even if you don't know you know that. It would be helpful to me if you would write out the Arithmantic equations of your work and how all the spells interlink. Much faster than me reverse engineering your work, which means we can move right along to new things.