PSI ... Please design your "Parker"-style refill and accompanying spring in such a way that the spring is held by friction onto the refill.
(The spring should not fall off the refill when the refill is removed for replacement.)
The problem at present is that your spring has the same diameter at both ends, a diameter which is just a little too big.
Supplying a spring which is narrower at one end would be a solution. There's already a slight bump on the narrow part of the refill to grip such a spring.
Berea does this.
Dayacom does this.
I'm tired of losing springs on the floor, searching for them using a flashlight and a magnet, and offending my wife with my language as she helps in the search.
My customers and other pen recipients tell me the same thing.
(The spring should not fall off the refill when the refill is removed for replacement.)
The problem at present is that your spring has the same diameter at both ends, a diameter which is just a little too big.
Supplying a spring which is narrower at one end would be a solution. There's already a slight bump on the narrow part of the refill to grip such a spring.
Berea does this.
Dayacom does this.
I'm tired of losing springs on the floor, searching for them using a flashlight and a magnet, and offending my wife with my language as she helps in the search.
My customers and other pen recipients tell me the same thing.