Hi xhall,
Yes they are meant to be a light press fit, but 9 times out of 10 they end up becoming loose on the shaft and the reel floats around inside the bearing.
There are two ways of fixing this and that is lightly knurl the shaft, but if that's not available to you then use a centre punch and carefully knock centre pop marks around the shaft at equal distances from each other as you rotate the shaft. That will achieve the same desired effect.
Cheers,
BB