I'm looking to get some new front end parts (steering stem, trees, bearings, and races) and as I understand it, the races can be hammered in (and out) with a block of wood. I recently heard that this is incorrect and that new ones need to be pressed in. Is this the case?
Is any stem & tree set-up (manufacturer) better than the next? When I took the front end apart I found that there was a difference in diameter of 0.003" between the stem and the bearings and so I'm replacing everything.
The cups should be pressed in on later models or any with timken bearings. The cup is real light and could damage easy. The earlier roller bearing types are just like a bicycle and could be tunked in with block of wood.
If you talking about getting the cups in the frame neck, try freezing them for a few hours. The cups will contract and should slide in easy. You can do the same with the races. And/or try all thread and some blocks on each end, but I wouldn't beat it too much with anything.