As far as I know there are no modern pumps designed to fit in a frame. Look on eBay, Craigslist, and the like for Silca Imperio, Zefal HP, and other frame pumps.
(Edited to admit that I was not aware that Zefal in particular still makes the HP pumps! That is good news.)
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Keeping Seattle’s bike shops in business since 1978
Last edited by Aubergine; 11-21-18 at 01:18 AM.