Over the years Chris has built up a large database of information about old flutes and especially those made by messrs. "Rudall and Rose". He can measure bores at any point in their length down to .01mm and has stored this information together with sound files in databases. Using shadowgraphs and measuring microscopes he has recorded information regarding key shapes and sizes, threads, and all manner of items for all periods of production of the firm of "Rudall and Rose" as well as information on some other important historic flutes. This information enables him to reproduce keys, blocks and even the pin positions on blocks as well as most other important particulars should the need arise.
This device allows parts to be projected onto a screen either 10 or 50 times full size. Tracings of the parts can be made and then later used as comparisons for new keys/items. Alternatively the tracings can be used with a pantograph to actually cut out the 2D shape.