Modifiche

In essence the ''bottom lever filler'' creates a sort of combination between the principle of the lever and the mechanism used in the [[button filler]]. In this case the lever is very short and positioned on a slot made on the bottom of the pen, the lever must be raised from its resting position, in which it is folded inside the bottom, and at that point pushing it further you go to operate an internal pressure bar similar to those used in the [[button filler]], which arching compresses the sac.

In essence the ''top lever filler'' creates a sort of combination between the principle of the lever and the mechanism used in the [[button filler]]. In this case the lever is very short and positioned on a slot made on the bottom of the pen, the lever must be raised from its resting position, in which it is folded inside the bottom, and at that point pushing it further you go to operate an internal pressure bar similar to those used in the [[button filler]], which arching compresses the sac.