Yes - exactly! I did the same, bought an adaptor but it was loose so sometimes would turn off in the middle of a set, leaving me waiting for it to power up again... And it makes the whole assembly big and clunky.
I have just bought exactly what stevenangier suggested. Just plugged it in and it seems to be doing the trick, and is quite sturdy and slimline too - perhaps even better than the original, minus the reassuring LED. Sure I was hoping for an even cheaper solution but $24 aint bad. Thanks for that stevenangier!