Sforno on Exodus 27:9/ספורנו על שמות כ״ז:ט׳

1מאה באמה ועמודיו עשרים, the space between one pillar and the next including one of the pillars was 5 cubits. However, there were no 20 pillars either along the northern wall or along the southern wall of this courtyard at such intervals but the ones linking up with the east wall and the west wall had to be adjoining the ones running at 90 degree angles from them. [the careful reader will perceive that it is impossible for all the pillars to have been placed five cubits apart from both their partners on the other side, as they would then have covered a total distance of more that the 300 cubits making up the total length of the four “walls.” Ed.]

2וחשוקיהם, sort of bracelets attached to the pillars for decorative purposes.