Step 1

1R is on the mark, forcing away

Step 2

2R takes over the count. 1R drops behind to cut off the dump to 2B. 3R cuts off the up-line throw. 5R comes all the way up to cover the far handler. The only open throw is a hammer to 4B or 6B, which 7R can cover.

Step 3

7R covers the difficult through to 4B.