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The ''bottom lever filler'', also called ''rear lever filler'', is a special lever filling system designed by [[Aurora]] and used from around 1930 for the [[International]] model, and later used also on the [[Novum]]. There are no known variants of this system used by other manufacturers, even if there are several patents with similar mechanisms, except the [[switch filler]] of the [[Pilot]], which has some similarities, in particular with the variant of this system adopted later on the [[Superna]] model.

<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''top lever filler'' is a particular lever filling system used by [[Aurora]] from around 1930 for the [[Internazionale]] model, and later also on the [[Novum]]. The first version of this filling system however, was used by [[Curzon]] for the ''[[Top Lever]]'' model (later renamed ''[[Debrett's]]'') of 1926. Since the patent of the ''[[Top Lever]]'' ({{Cite patent|GB|273357}} and {{Cite patent|FR|628272}} which is even more similar to the mechanism found on the [[Aurora]]) is from 1926, it is incorrect to attribute the invention of this system to the [[Aurora]]. There are no other known variants of the system used by other manufacturers except the [[switch filler]] of the [[Pilot]], which has some similarities, in particular with the variant of this system adopted later on the [[Superna]] model.

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.  

The system is rather complex and delicate (given the small size of the lever the efforts to be applied are greater), and to avoid deforming the body of the pen [[Aurora]] inserted a reinforcement inside the same (made with a thin metal cylinder of aluminum inserted on the inner surface) that further reduces the space available for the sac.  

The system is rather complex and delicate (given the small size of the lever the efforts to be applied are greater), and to avoid deforming the body of the pen [[Aurora]] inserted a reinforcement inside the same (made with a thin metal cylinder of aluminum inserted on the inner surface) that further reduces the space available for the sac.