Do I have to buy complete sets of both Intermediate and Final cauls for each key pin size to use the two caul method?
Not exactly. Caul sizes are specific to a given key pin size, since the idea is to mold the bushing to an exact fit to the pin. However, you can economize by using only 45 Intermediates for each key pin size, pulling the first ones out and reinserting ahead as you work your way down the rail. (You do need at least 90 Finals to work efficiently since the Finals need to stay in place several hours until the glue hardens to size the bushings.) Also, some sizes do double duty; i.e. the Intermediate for one size of key pin serves as the Final for another in some cases. See the bushing caul size chart for details.
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