that's a good pickup John/RD, good call
if the sleeve can be loctited back in place that's a great start but its unlikely to be a robust joint after its been wobbling about for a while, so will still need a mechanical "hold" of some sort to stop it walking out again if/when the bond breaks - I know drilling and threading the centre for a bolt could weaken the axle a bit, but realistically a high tensile fine threaded bolt of a smallish diameter with thread length inside the axle of only say 20/25mm (ie within the length of the slider bush) with a big washer, in conjunction with the loctited bush and the clamp bolt on the other side should be reasonably robust I would have thought. It wont have much tensile load on it, more of a location holder, so could be just 8mm ish, just to inhibit the side thrust in conjunction with the clamp bolt on the other leg. AND, when you look at the end of the axle its already been centre bored, so wont need to be too much more than whats there already.....what do you think??