The Mid Swing was discontinued Sept. of 2009.
The Sr. Swing control box has the power boost feature which the Mid Swing control box did not have. If you replace only the Mid Swing control box with the Sr. Swing control, and the power boost ever gets turned on, the Mid Swing gearbox will run backwards, indefinitely. So when replacing an obsolete Mid Swing control box, we recommend you replace BOTH the Mid Swing control box and gearbox at the same time to the Sr. Swing parts to avoid an this potential issue.
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