I decided to post this solution noting that it is a known issue, I hope it can solve this problem for many others

I bought a Divisumma 24 years ago in fair condition which was missing the power cable, immediately seeing the difficulty in finding the cable, I immediately got to work to be able to make it in 3D, I hope it can solve the problem that many enthusiasts of mechanical calculators Olivetti from the golden age of this company have

Battery plug for Casio cg-110 and similar

This covers the belt on the crankshaft, when mounting an American oil pump with an eu cover. Use temperature resistant materials such as ABS

Gamata hilt dagger of the ancient Nuragic warriors of Sardinia, I made it as a gift for my grandchildren and to make them better understand the history of ancient Sardinia