Eaglerapids reminded me...I first tried a Kirk L-shaped "flippable" flash bracket (not to be confused with camera L brackets). The small ball head supporting the arm on the bracket never could support my AF500FTZ flash. So now the Kirk bracket sits in my "parts pile" to rob QR pieces etc. I suppose with a replacement mini-ball head it could be made to work, but...
And actually getting used? Two Really Right Stuff flash brackets, one large another smaller--models they don't currently make as they've upgraded in the ten or so years since I bought mine. Both work great, even after falling out of the truck on the freeway this fall...Perhaps it might be less expensive to do it right the first time?
Anybody else have a cheap ineffective tripod sitting around that was upgraded for the tripod that should have been purchased in the first place? Eaglerapids nailed this one big time...buy the best flash bracket you can find/afford with the expectation that you'll never need to upgrade again. It's less expensive that way!
So I guess this means I can't offer you a Kirk L-bracket for flip flash really cheap? It only needs an inexpensive mini-ball head to be fully functional...