When it comes to plumbing a bathroom sink drain, it might actually be less ... to buy one of the newer (and pricier) push-to-connect fittings like Keeney's Insta-Plumb 1 ½-inch and 1 ¼-inch ...

Then use channel lock pliers to give the fittings one last partial turn ... to fix a leak or you want to get rid of the steel ...