An end sealer shifting assembly, comprising a transmission, a push rod assembly which is driven by the transmission, and end seal compression jaw in driving engagement with the push rod assembly, and a compliance assembly for jaw compliance with a contact member (e.g., a heater wire cutter cross cut jaw) when the jaw is driven into a compression relationship with the contact member. The compliance device preferably includes springs and the transmission assembly preferably includes a cam device with a second spring working to retain a contact relationship and work together with the compliance spring. A method of assembling such a device and operating such a device is also featured.