I built a singlespeed bike last year, mainly from old parts of mine and a frame/fork donated to me by a pal. I needed a few extra parts and wanted to build the bike for the smallest amount of money possible so I searched
eBay and found a no-name headset for it for about £8. That turned out to be a false economy! The cups went in far too easily and it turned out to be impossible to get the headset tight enough and free-turning at the same time. Either it was loose and free-turning, or it was tight and barely turned at all.
I rode the bike through the winter and the tight steering was starting to bug me so that headset had to be taken out.
In the end I bought a Ritchey headset for £15.99 and replaced
il cheapo with that today. I don't have a press to put the cups in so I decided to very carefully tap them in. I read what I thought was a useful tip - put the cups in a freezer for an hour before fitting them. The idea is that they shrink ever so slightly and are easier to fit if you can get it done before they warm up again. The cold cups were still a reasonably tight fit but I was able to get them in without having to wallop them. I used a piece of timber to protect them and tapped the back of the timber with a hammer, being careful to knock the cups in straight.
The cups looked like they were fully in but I shone a bright torch at the back of them and could see just a sliver of light beneath them. A firmer tap with the precision fitting tool (hammer!) removed those gaps.
I reassembled the bike and rode it down to my local Lidl to test it. It felt pretty good. It was only a short ride so I will have to do some longer test rides - I want to use that bike on nickyboy's 100 mile ride from Manchester to Llandudno next month and I don't want to risk it letting me down.