I believe you need a 4mm punch. Depending on your location road salt may be a factor. A few solid hits should get the pin moving, especially if you soak the pin with PB Blaster for a while.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.