Maybe I am a little late to the party, but what I did was really simple. I had an old drain flange from a garbage disposal I installed years ago. The flange wasn't leaking so I left it be and filed the new flange that came in the box with all the other crap I keep and never use. One day, I thought, Hmmmm, this could be of some use after all. I drilled 3 holed in the flange just below the ridge that sits in the sink. Centered it into my kettle and measured out to the ridge of the kettle. Added about 1/2 inch for user error. Went to my local hardware store and bought 3 long bolts, 6 washers and 6 nuts. Put one nut and washer on the bolt and screwed it in as far as it would go. Pushed the bolt thru the flange and used the second nut and washer and just went to the edge of the bolt so that none of the bolt was showing. Screwed the nut I had put on first into the flange and pinched the flange between the two washers. Did that 3 times and Viola, I put a hop bag thru the flange and into the wort, use 3 or 4 aligator clips to hold the bag to the flange and off I go. The only drawback is the flange gets hot, so I have to make sure I have an oven mit at the ready. I think the whole thing cost me less than 10 bucks and it works great. Pictures available on request. LOL.