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What is this mystery threaded hole for?

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What is this mystery threaded hole for?

Old 09-13-21, 06:44 AM
  #26  
USAZorro
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Mount for a mini-pump bracket?
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Old 09-13-21, 06:45 AM
  #27  
himespau 
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Originally Posted by Doug Fattic View Post
Back in the late 80's I remember putting some under the top tube water bottle bosses to hold a short Blackburn pump that had a holder designed for those under the top tube bosses. I don't think Blackburn made that holder for long. They went to holders that could fit on the side of a water bottle cage but was held in place by its bosses..
I was wondering there was something like that that it could be. Did the holder use one or 2 bosses? Was it proud enough to get over this number holder - I'm pretty sure it's brazed on, not screwed into a second boss?
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Old 09-13-21, 07:23 AM
  #28  
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Originally Posted by himespau View Post
I was wondering there was something like that that it could be. Did the holder use one or 2 bosses? Was it proud enough to get over this number holder - I'm pretty sure it's brazed on, not screwed into a second boss?
The Blackburn holder was held in place with 2 water bottle bosses (M5 thread). The pump clipped into the holder and was held more securely in place with a velcro strap. The velcro strap went around both the pump and the top tube. I believe that holder would have worked with the 2 boss arrangement on your Colnago. The number plate boss could have slipped through the holder slot and the other boss and velcro stop been enough to security hold the pump.
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