I very much like Letro as well.
This would be my method for not using a pill splitter to get the appropriate dosages:
1. Weigh out the pressed pill completely. For example lets say it weighs 150mg.
2. You know how much active ingredient the pill has (2.5mg letro/pill)
3. Set up an equation for the dosage you'd like to be taking (Xmg) by using a proportions:
A = Active Ingredient Mass (mg)
B = Total pill Mass (mg)
C = Desired Active ingredient (that you'd like to be consuming) (mg)
D = Some fraction of the Total Pill Mass (mg)
A/B = C/D
Example:
A = 2.5mg (mass of letro in a single cap)
B = 150mg (example total pill mass)
C = .25mg (desired mass Letro)
D = Unknown amount of cap that would be used to achieve the desired dose 'C'
(2.5mg/150mg) = (.25mg/D)
Solving for D = 15mg
so in essence, if you crushed up that pill completely, weighed out 15mg of the powder that was left, you'd have 0.25mg of Letro.
Or if you took all 10, crushed them up and added them to 99.75ml of everclear you'd have a solution that contained very very close to** .25mg/ml of letro.
**assumption is made that the density of letro + filler (most likely magnesium stearate and other carbohydrate fillers) is about equal to that of grain alcohol. This assumption is good enough, but if you wanted to get super precise you'd pull up a Pharmacopeia reference manual, see what ingredients are in the tablet, calculate the density of the mixture, multiply the density of the mixture times the total mass of the powder, subtract that from 100ml.