Hi,
yes the the pusher base can be unscrewed. I think you can find replacement Nos pushers on eBay.

: Hi guys,
: just obtained a (very) worn barrel cased Carrera, with both pushers
: gone.

: Can someone advise whether the pusher bases (the fluted part in the
: photo) simply unscrew so that I can determine the appropriate
: thread size to purchase replacement pushers? As you can see the
: case is pretty worn but it keeps good time. Have been quoted
: $1900 to repair so I think not. I will just do a clean up and
: make it respectable. Hope the photo link works.

: BTW this is a great site

: regards
: Peter