# Why does the Spring have a great shed all the time?
The answer lies in the parallel countermarche system. The Spring has two lams for every shaft—one upper and one lower. The lower lams pull shafts upward, and the upper lams pull shafts downward. Each lam (and therefore each shaft) is tied to every active treadle. This means every shaft either moves up or down each time a treadle is pressed. As a result, every warp thread is forced either upward or downward.
This differs from a jack loom, where only the active shafts are raised. In a balanced warp, approximately half of the warp threads remain stationary while the others are pulled upward.
What also commonly happens with Jack looms and table looms, the lower shed is pulled upwards slightly through the shaft lifting process and this consequence of lifting the active shafts, reduces the shed size.
With the Spring loom, every warp thread is actively moved with every treadle depression, ensuring full thread separation and guaranteeing a consistently excellent shed.
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