Originally Posted by
The Golden Boy
The head tube being cast with sockets- so the tube doesn't have to be mitered so precisely.
In the 1985 Trek catalog it's mentioned for a "cleaner, more precise braze"
Page 2 on the right side:
http://www.vintage-trek.com/images/t...troduction.pdf
And I don't think it was in place for the 720 until 1984. The 82 and 83 look like normal to me.
I don't know about those headlug modules or whatevers. I don't see any outward sign of non-genuine lugging on my 610, the 600 I formerly ride, the 620 I had, or the 720, so I can honestly say I'm clueless. I have trouble seeing how those lead to any sort of structural deficiency or misalignment, unless perhaps they invite a lower level of craftsmanship?