I am seeing quite a few Blanknuts for sale on the net [ EBay as well as the HP classifieds ]. Actually I was thinking of purchasing one.
But I was going through a manual called 'A guide to HP Handheld Calculators and Computers' by Wlodek Mier-Jedrzejowicz [ quite a good book for any HP Calculator collectors I might add ]and in it is a colour photo of a Blanknut HP-41 but there is a small plastic bar over the USER and PRGM keys. I was just wondering if it is possible to 'doctor' a normal HP41 to appear as a Blanknut.