Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
I used the kit from Pyramid Parts and whilst it did fit there was only 1.5 turns on the castelated nut. I contact Pyramid and they requested photos and these were duly sent with the measurements. Pyramid admitted the kit was not suitable for the 400/4 despite their listing stating it was and gave me my money back. This was the same kit many have used on here. Pyramid agreed with my findings that it could be dangerous. I bought a set of caged ball bearings in the end and they fitted perfectly using a 2mm shim on the lower yoke.I have contacted Pyramid a couple of times since to request an update and I also voluntered to try the stepped bearing they were proposing but they told me they are currently speaking to several restorers of these machines to obtain a solution. Needless to say I had a pig of a job to get the taper races out of my newly powder coated frame!