I've got an older Bianchi MTB frame made w/Columbus tubing; a real nice VERY light Chromoly frame. I plan on setting it up w/corrected rigid fork and a bunch of NOS shimano xt/xtr 8 speed stuff I have lying around.
Before I started stripping off the old components I noticed a bit of rust on the seam of the top tube to the lug to the headset. After scraping away the paint/rust in the area it looks like there may be a (tiny) bit of separation on a portion of the lug and/or the original braze was not complete for ca. 15% of the circumfrence of the lug/tube. Is there an easy way to tell if this is the start of a crack/separation? ( i was thinking perhaps magnafluxing?) Should I have someone rebraze the lug/tube? Any other suggestions on similar repairs will be appreciated
Thanks in advance, happy New Year