Tooling and testing for the Boston Model 17 Pencil Sharpener replacement gear are now complete. Replacements have been tested for fit and functionality, and are now available. I have already posted a listing on ebay for this part. The current listing item# is 130419932867 or try this link: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130419932867
Clarification on earlier posts - this gear is only for use with the Model 17. The Model 18 replacement part is only interchangeble for use with Model 19.