Alrighty,then!![
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What Alfred said,more or less;
http://www.woodturnerscatalog.com/store/Pen_Making___Apprentice_Pen_Kits?Args=
Go to a kit,then the instructions are there as a PDF.
I saw someone's post recently about econo-grade
slimlines with a larger nib than usual.
The "apprentice" slimline calls for .337 bushings.
CSUSA's regular slimline bushings mic. .333
My personal thoughts below,sorry,can't help it.
(I can imagine the possibilities for aggravated customers.
Sure,IF you read carefully,their instructions mention
that the apprentice kits need different bushings.BUT...
It also tells me these are from different tooling at
minimum,and probably a totally different factory.
So,the plating is not the only difference.
None for me,thanks.I'll stick with the regular slimline
at 4.25 or so.I know they are good quality,and my time
in turning,and my reputation that goes with a pen,makes it
an easy choice for me.
Caveat Emptor.)