Arsenal ended their winless run with a 5-0 victory over Crystal Palace yesterday, and there were several noticeable changes. The Gunners have been strong from set-pieces for most of the season, but recent games saw them struggle in both boxes as it became an area of weakness. It recently emerged that Mikel Arteta and his staff used the mid-season training camp in Dubai to work on both their attacking and defensive set-pieces, and this paid off greatly against Palace. David Raya was very comfortable in goal as Arsenal successfully defended Palace corners and free kicks with ease, and Gabriel Ma…