Nobody stopped from servicing the hub and replacing axle with extra spacers to whatever needs were necessary at the moment
Side note. Such wheels were also used for track just swapping them with narrower axle and less spacers
UPDATE
3ttt Racing Team Service Competizione Gimondi bend. 26.0mm clamp. 42cm center to center. 25 euros
3T Racing Team Service Super Competizione single groove handlebars. 26.0mm clamp. 40.5cm center to center. 30 euros
Boardman Elite compact black alloy handlebars dropbars. 31.8mm clamp...
UPDATE
NOS Kharkov front derailleur. 15 euros
Soviet road spindles. 7 euros per spindle
Used Takhion 3/32" BCD 144 – 53t chainring - 100 euros
New Kharkov breakshoes - 5 euros per pair
NOS with flaws (1 freewheel spinning roughly) 1 used freewheel that working fine. Kharkov freewheel 5...
UPDATE
Few Mavic parts for sale:
Mavic 550 RD front hub with sealed bearing. 100mm. 36H. Spins smoothly, no play. Comes with Mavic quick release skewer. 45 euros
Used Mavic 610 bottom bracket lock rings lock nuts - 5 euros per ring
Used Mavic quick release skewers front and rear set - 30 euros...