MILISTEN Lyre en métal pour clarinette et fanfare

Having only received this yesterday, I haven't had a chance to test it with music, though it feels sturdy in its construction. It had a sharp edge on the inside of the ring where the two sides join up, which I didn't realise straight away, and it has scratched my instrument. A quick filing has sorted this out. There are no instructions or leaflets with this product. It took me a while to work out where it fits on the clarinet, and that one side of the ring is slightly wider than the other. For any future purchasers, this seems to fit best between the middle joints - it slips nicely over the metal joint ring if you put it on wider side first, and it doesn't get in the way of the joint mechanism. I couldn't get it to fit on the bottom joint, despite the product images suggesting this is where it should go, as the ring doesn't seem wide enough.