I made some changes to the Puch recently.
I changed the 80mm ITM stem for a 100mm Nitto Dynamic.
It's a beautiful stem, and I really could use a bit more reach on this bike.
The other change was to the brakes. I swapped out the Modolo "Quattro" (Mach 1)
for Ultegra 6500 calipers w/BL-R400 levers.
I do not have a positive opinion of the Modolo levers or calipers that came with this bike.
There is no comparison to the new setup. Braking is excellent now.