Sierra Tranmossions

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Awhile ago we had a group buy for 8.4mm x1 taps that matched the threads on the Sierra transmissions. You can make some nice "almost" kitless ball point pens with them. I believe mredburn was selling the taps at one time also. Here is an example of a pen made with a sierra transmission using Aluminum.


 
Although I still sell them, INdy Pen dance currently has the 8.5 x 1 for sale cheaper. THe 8.5 will work just fine for you.
 
We have found that there are a couple different sizes of transmissions out there. Many of the aftermarket transmissions will not fully screw into a Sierra. These after markets, I am pretty sure will only work with a M8.4 x 1 tap. If they are leftovers from a Sierra or Wall Street then you should be fine with a M8.5 x 1
 
Thanks all - I have an 8.5 x 1 and think these are "Sierra" Transmissions however mredburn I've sent you a PM regarding the 8.4 x 1. - Thanks again everyone for the help.
 
This is the dummy asking questions. I like working with the cigar pens. Will the 8.5 that you were speaking off work on the transmission purchased for cigar pens??
 
IPD_Mr said:
We have found that there are a couple different sizes of transmissions out there. Many of the aftermarket transmissions will not fully screw into a Sierra. These after markets, I am pretty sure will only work with a M8.4 x 1 tap. If they are leftovers from a Sierra or Wall Street then you should be fine with a M8.5 x 1
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Are those the taps that I sold you?

I made several .308 pens using Rizheng sierra transmissions. The M8.4 tap did the job just fine.
 
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