That's why I bought my Sig sight pusher tool and have used it more than a dozen times already on my and my friends Sigs. It's not just putting the sights on, it's also adjusting the sights for zeroing the gun at the range. Most likely the $20 fee included sighting it in. But that's the advantage of having your own sight tool - you can adjust them easily anytime. A friend shoots my pistols about 2" right of center at 15yds even though I'm dead on. He's left handed and I'm not.
