Great news, I usually purchase my cartridge parts from the states but they now appear to have discontinued the connector board.
Kenwood audio in the UK now have the parts in stock, Telephone number is 01728 746500
Parts required to build a complete DMS are as follows
DMS-CASE-0001 Cartridge Top Case
DMS-CASE-0002 Cartridge Bottom Case
DMS-CASE-0003 Cartridge Latch
DMS-CASE-0004 Cartridge Button
DMS-CASE-0005 Cartridge Spring
DMS-CAP-0001 Top Rubber
DMS-CAP-0002 Bottom Rubber
DMS-IFBD-0001 Connector Board
The only part that they cannot supply is PNCL-130002, but this is 4 x M3x6 screws, these are standard parts available from any hardware store.
Total cost for all the parts including the VAT and shipping is £49.00
This means that you can now build your new DMS without opening your original cartridge.
I have just ordered the case parts along with a solid state drive, I will post my results after I have built and tested it