Rebuilding carburetor, what is this plastic film from choke housing

[dirtymac]

I suspect this is nothing but want to make sure of that.  I'm rebuilding a carbuertor, motorcraft 2150, that i bought used.  It had a lot of soot and other buildup and I decided to take the choke apart while cleaning it.  When I did, i found a piece of translucent film around a piece of the linkage that goes through the outside of the housing and attaches to the inside piece.  It was actually stuck in the housing when I removed the linkage and I didn't notice it.

In the image, I have it circled in red.  It is torn.  The areas circled in green are the hole in the housing where I found it and the brass piece of the linkage that it was (presumably) adhered to.

[85lebaront2]

That was a Teflon bushing for the choke shaft. A lot of the rebuilders replace them with a brass or bronze one. That involves boring a larger hole in the housing.