I tried cutting thin strips of foundation and putting them in the top bars of my frames. Even sliced one side of the grooved frames off on the table saw, turning them into wedge tops, in an effort to get the strips of foundation to stay. That didn't work well so I tried adding hot beeswax to "glue" them in and they still fell out. Now I cut thin strips of standard 1X lumber and glue them in the grooves of my top bars. Then I coat them with wax. I also run two strands of 50# test monofilament line through the frame for comb support. This year I bought some of the WTK foundationless frames, coated them with wax and added two runs of fishing line for comb support. Too early to give a report on how well they did. Anyone else have a report on WTK foundationless frames?