Many German transverse shuttle machines such as the Frister & Rossman and Gritzner came with a grinding wheel to resharpen needles. It was placed on the post that was on the right hand side on the bobbin winder. [ATTACH=CONFIG]371157[/ATTACH]
The grinding wheel that fits my Frister & Rossman (from about 1907) also fits my Wheeler & Wilson #8. It fits over the post that the bobbin fits on when it is being wound. [ATTACH=CONFIG]371156[/ATTACH]