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@Betty_Swollocks
DIY homemade headset press that does it everytime....get an 18" length of stud bolt from a hardware shop plus two 17mm nuts and two 3/4" steel washers (should all be around £5.00) then press the upper and lower headset cups into position and as straight as poss. screw on one nut and washer a short way in on the end of the stud bolt and then offer into the headtube, now screw on the other nut and washer on the bit of stud that protrudes at the other end of the headtube and do both nuts up fingertight....making sure the cups are still seated straight now proceed to tighten each nut evenly with a suitable 17mm spanner and continue tightening until they press the cups home nice and straight, much better than hammering as that can damage the cup edges