Mine too. I had a similar problem with my easycares a few weeks back - needed to weigh for wormer doses.
As luck would have it I inherited a set of scales (the type you hang up with a hook on the bottom) from the previous residents so all we had to do was figure out how to dangle sheep from the scales: The lambs were easy - just put 'em in a builders 1ton-bag and hook 'em on; the ewe's were a bit more of a challenge. In the end we found a couple of webbing strops about 2' long, one behind the front legs, one before the hind, a bit of rope looped through, and HEAVE 'em up onto the hook. I wouldn't recommend it though - my back still hasn't recovered from doing Fatty (168Lbs / 76Kg).
So another project on ever growing list: make a weigh-crate before I need to weigh 'em again.