Its probably not a bit that can just be brought on the web, may be worth talking to Samsung to see if they will supply you with the bit
Company Samsung Electronics (UK) Limited
Address Digital Still Camera Repair Centre, Regus Building, 3000 Hillswood Drive, Chertsey. KT16 0RS
Tel. Sales – 01932 455320 / Service – Technical & Repair – 0845 SAMSUNG (7267864)
Fax.Sales – 01932 455585 / Service – Technical & Repai
Contact Person E-mail-Homepage
http://www.samsungcamera.co.uk warranty