New old stock Universal Engineering / TSD Kwik-Switch II automatic locking nut assembly. Customer Stock Number: MXME38076. Tooling System: Kwik-Switch II. Type: Automatic Locking Quick-Change Tooling Nut Assembly. Patent Marking: 3,829,109. The nut body is permanently engraved. “TSD #808155 KWIK-SWITCH II”. Customer inventory records describe this part as. “TSD Nut Assembly for Quick Change Tooling”. “For Cross 3, 4 & 6″. “808155 Kwik Switch II”. This is a Kwik-Switch II automatic locking nut assembly. Kwik-Switch II automatic nuts are different from earlier Kwik-Switch I manual nuts and should not be assumed interchangeable. The listing includes the nut assembly and the loose spring and locking components shown in the photographs. No additional tooling, master holder or wrench is included. New old stock from industrial storeroom inventory. The original storage bag and identification tag show shelf wear. Part number 808155 does not appear in the current public Universal DeVlieg replacement-nut chart and may be an older or application-specific configuration. Customer records associate it with Cross 3, 4 and 6 equipment, but the exact Cross machine models and Kwik-Switch size have not been independently confirmed. Please compare the engraved part number, outside diameter, internal thread and locking arrangement with your existing assembly before purchasing. Everything included is shown in the photographs.