Bought this off Delberthot on Saturday, it arrived today, but unfortunately, it can't be modified to fit a 4003 (there's that hairbrained plan out of the window... Doh!).
The post is 17.5mm / 11/16".
I paid £65 + £5 postage (Friends & Family), and would like the same.
Original post:
Hipshot BT1 Xtender
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Hipshot BT1 Xtender for Musicman etc - -SOLD- - Accessories & Other Musically Related Items For Sale - Basschat.url