
Fix-
Depending upon which original base was used and which mounting method was employed, only style #402 may be modified to attach the base and mechanism together permanently. That is, by providing a single machine bolt and large washer at the underside of the chair base. Style #502 cannot be modified for this feature.
Drill a hole into the solid steel 4 1/2" spindle center end and Tap threads to match bolt. Install and tighten bolt with large washer, but not so tightly as to prevent swiveling.
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