March Mutant 25: Adam's Grapple (total / no numbers)

Draw a single loop that connects the grid cells. The loop may only travel horizontally or vertically, and never diagonally (so all turns are of 90 degrees). The loop may only turn at the centers of grid cells, and may not cross itself or branch off. The loop must pass through and turn in every cell with a question mark, and the two line segments which meet at such a cell must be the same length. A question mark has been placed in every cell which could legally contain one.

You know this puzzle is of good quality because I made it in late 2010 (judging by its location in my pad of graph paper) and never bothered to publish it for over a year! Happy Quantity Not Quality Month! Hope you weren't too attached to the concept of having numbers in a logic puzzle!