Originally Posted by
FBinNY
A length of 1" (I believe) water pipe does the trick. Have the place you bought it cut it squarely, and deburr the inside with a deburring tool, or round file.
However having more striking power, doesn't mean you can pound a 26.4 (nominal) crown onto a 27mm fork with cracking it. So first check size, then have at it.
This is what I use. The pipe is not hardened, the race is so it doesn't get damaged.
FWIW, I never hit the pipe with a hammer, I tap the pipe/race/fork against the floor and allow the fork to do the work...