White replacement motor spring only for adjustable DOPPLER on PEUGEOT 103 and MBK 51 (flexible)

Made in the best steels, here is the "flexible" DOPPLER motor spring replacement for the complete motor springs of MBK 51 or PEUGEOT 103 , all models combined.

Also ideal for making a homemade mainspring or for adapting to another period spring. ( SOFT hardness)

Comes painted white .