any idea what tool I need to take this freewheel off?

World\'s Dump

I would like to build some new wheels myself. However I am going to use the original hubs rather than buy a new lot. Can anybody recommend the correct tool for the attached hub?

It's a wheel from circa 70s/80s..... any ideas?

Thanks

ugo.santalucia

Park Tool FR 4

nicklouse

how many splines?

20? is yes as above.