So I’m sure you guys have worked out how much of a grease monkey I am…and so changing a simple thing like trunnions for you becomes climbing Mt Everest for me…
An update…
Brown Bear (Matt) dropped in with his Dad to check out the wagon. While he was there I explained the trouble I'd had and gave him a job…install the trunnions. But with some closer inspection his Dad pointed out that the levers were slightly bent which may be the cause of the trunnions not sitting properly. Then I visited Dr Terry and arming myself with some more info, advice and some ‘can do’ attitude got to work…
I visited the back shed and grabbed a parted out steering column and found that the levers weren’t bent and it still had an original trunnion in place and in good condition

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Then I wedged a socket in place to push back the spring and unscrewed the bolt to release the first lever. Note it has a small ‘pin’ that helps locate the lever in place. Also the bolt has a special washer that only fits one way.
Then I unscrewed the second lever. I had my ‘new parts’ which I gave a quick clean up.
Because I was working alone I pushed the column spring down and used a screwdriver to get some release from the column spring.
Then I did the reverse of the above and screwed the first lever back on. I used the socket to get some room and fitted up the second lever and screwed the bolt back on. It is possible to do this with the steering column in the car but it would be much easier doing this job on the bench.
Then I took a look at the FB and noticed it doesn’t have any trunnions…and I have been driving that for 20 years…I guess you don’t really need them…
Stewart