What is this mystery threaded hole for?
09-13-21, 06:44 AM
#26
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Mount for a mini-pump bracket?
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09-13-21, 06:45 AM
#27
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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..
09-13-21, 07:23 AM
#28
framebuilder
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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