go to the Varimixer web site and look under customer support. Depending were you are there are 3 names you can email. I’m not certain if any changes where made to the shaft between the “A” model and the present “D” that they renamed a Kodiak.
How long has this unit been in service and how hard is your water. The boosters do build up minerals over time with hard water.. Just trying to fully understand what you are dealing with.
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