The 7" Idler Arm Upgrade, from Kessler Crane, enables improved dollying operation with Kessler's K-Pod dolly trucks when using the trucks on track that isn't perfectly straight. It allows the trucks to adjust for slight variances in the track.
This 7" Arm allows for 14" of movement, and enables the K-Pod tripod to be used on standard 24" wide dolly tracks.