Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, your general location please?
And as this particular model is no longer available currently as a new item, would another comparable brand/model serve your need?
I re-checked the Service Manual and unfortunately, the VCR deck/mechanism is no longer available nor is there a used/second hand Funai T3B-N8182DB being offered.
Please post back how you would want to approach this and/or should additional information be needed.
Or would you perhaps consider a second opinion?