When I acquired my first Seven, in kit form, I can still recall the fight I had assembling the drag link cups, balls and springs. So some 20 years later when I acquired our second Seven it had a nasty case of severe front wheel and steering wheel wobble if I hit a bump at low speed. So the drag link was stripped and new cups, balls and springs fitted which I thought would cure the problem, no it didn't. Then I recalled the fight I had assembling the first one and I thought this one was assembled with ease, so I stripped both drag links down. Nothing appeared to be different till I looked inside the drag link end caps, the one off the first car had something in it which was eventually persuaded to see the light of day. This was a truncated conical spacer, not shown in the Austin parts book, after a check of my spare drag links I found two and both drag links were assembled with ease using a sash cramp (see photo) and the wheel wobble problem was cured. Some years later Bryan Purves Source Book was published and there on page 153 was a drawing under the heading Adjusting steering ball connections, the only copy of this I've seen. This shows that the clearance should be adjusted to 1/64” to 3/64” using shims. Attached is a copy but I don't know about the copyright issue, I suppose the intellectual rights belong to the successors of the Austin Motor Company. I find that it is much easier working on a component on the bench that under a car so I invested in a ball joint splitting tool to remove the taper fitted drag link ball pins from the steering arms. Then with the aid of a sash cramp the drag link can be easily dismantled and reassembled.See photos.