Pentax 23903-C17 Click Spring
Genuine Pentax wind lever click spring for the ME, ME Super, MG, and the MV-1 film cameras. Made by Pentax Japan.
Please note. This is one of the most common parts to break on these model Pentax's. More important than just replacing this spring is locating the piece that broke off. If the broken piece cannot be located, keep in mind not to force the winding mechanism if you feel abnormal resistance. The broken part could be telling you where it is.