David 3 - General shaft issues

If you feel your shed is uneven—meaning the top of the shed is not in one straight line—this indicates that the slope of the harnesses from back to front is uneven. Adjusting this slope will correct the unevenness. It may take some fine-tuning to get it right, but once set, it will remain stable.

If you feel your shed is too small—for example, 2" instead of 2.5"—you can raise each shaft by 1/2", all by the same amount. Increasing more than 1/2" is not possible, as the harnesses must not touch the cams.

This article shows how to adjust shaft heights. David 3 - Shaft system described