Which Pentel Mechanisms?

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Joined
May 12, 2006
Messages
217
Location
Nashua, NH, USA.
I have a question for those of you who have made pencils using the Pentel mechanism.
Since I'm only using the guts, it would make sense to me to buy the cheapest model I can find if the mechanism is the same in all models.
Is that the case or am I limited to a certain style of Pentel?
 
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