Osburn AC02006 - Manual (Page 10)

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To secure the liner to the insert, install the adapter parts in the following order:
the tightening handle, the washers (needed quantity varies depending on the
type of insert) and the nut on the retaining rod. Tighten the nut using a 3/4”
wrench until the tightening handle rests firmly on the underside of the insert top.
Caution over-tightening the nut would damage the adapter.