Jr Gent pen bushings

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Forum topic by D_Allen posted 02-26-2012 03:09 PM 1479 views 0 times favorited 1 reply Add to Favorites Watch
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495 posts in 3018 days

02-26-2012 03:09 PM

Hello all.
I’m hoping someone here can confirm an issue I am having with pen bushings.
I have an Apprentice Jr Gentleman’s pen kit from CSUSA. Since I had never used the drill bits for this size before I got the correct bits and ordered the 19A bushings from Berea.
Upon inspection I found that the bushings for the smaller diameter tube are too small. The ones for the larger tube are fine and are within less than .002”. However, the ones for the smaller tube are off by .008”, tube size is .366” and bushing is .358”. I plan to write to Berea and ask them to check the size.
The tubes measure the same .010” that other tubes measure so they are not too thin.
Anyone here have the 19A set who could measure the smaller ones to check me on this?


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1 reply so far

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495 posts in 3018 days

#1 posted 02-26-2012 09:21 PM


Apparently the longer tube in this set IS thinner. My caliper is not exact enough to be sure of the size when measuring on the ID. However, upon closer and more exact measurements, the thickness of the tube is slightly less than other tubes I checked. And, it occurred to me that whatever the variance in the tube thickness, it must be doubled when considering the total size. So, if the tube is .004” thinner, then that would translate to the .oo8” difference. Is that a gnat’s hair thickness? A micrometer would show the difference more exactly. It still seems odd that the other tube fits the bushings fine and in accordance with 2 different charts that list the specs of tubes and bushings.
I suppose if the tolerances for the manufacturing of these tubes is something like +/- .005, then it would still be within spec.
However, it is difficult to image how anyone would be able to get a good round blank when using these bushings with this tube. And I do not fault the bushings, they measure correctly. I will have to make my own set of bushings for this particular kit.

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