Left: Homemade flywheelpuller puller. Bosch and Wico-pacy bantamag have 3 holes with M4 thread. Wipac series 90 have 4 holes with BA2 thread. 
Right: Homemade exhaust nut spanner. With this tool you can remove exhaustsystem without removing wheel from bicycle.
Bottom: Homemade enginestand.

Use this type of extractor for crankshaft bearings.