Unlike the Citroen 2CV, which is the other type of minicar I own, the 451 is crafted with fine engineering in mind and as such, can best be served by having a variety of essential and special tools handy.
So far I have noticed that the following are essential for work on the car:
-1/4" and 3/8" drive ratchets, breaker bars, extensions and universal joints
-Metric short and deep-well sockets to 21mm
-Stubby and standard six point combination metric wrenches from 5mm to 21mm inclusive
-Variety of TORX-drive metric sockets from T-9 to T-60 in different drive sizes
-Variety of lengths of flat blade and Phillips screwdrivers
-Pliers of various types to include: slip joint, channel-lock, diagonal cutters, lineman's pliers
-Multiple sizes of pin punches and C-Clamps
-Multiple sizes of mandrels
-Small and medium ballpein hammers and 2lb dead-blow hammer
- Crimping set to repair wires or make splices and some wire to go with it.
- An inexpensive volt-ohmmeter with leads
- A good OBDII diagnostic unit. I have a Foxwell NT-510 made for MBs and smart models
Anything else you can think of? I am especially interested in MB special tools related to the smarts.