The more minor difference are small metal bridges in the rear fork of the new triangle. These are easily removed with a junior hacksaw. The more major difference is the new frame only has one braze-on for a gear pulley block (these slide into the braze-on and are secured with a threaded metal ring where the Bowden cable enters the block). The required additional braze-on is very carefully removed from the old frame using a rotary tool such as a Dremel.
