Right, i've finally sorted it.
I replaced the phillips head screws for hexes, but couldn't get ones that were a perfect match, there is one from Axial but no-where had them in stock, so tried two different types from HPI
Top is M3 x 45mm
Middle is standard Hyper TT M3 x 35mm
Bottom is M2.6 x 35mm
the M2.6 is the perfect length shank and thread, but there is just too much movement for my liking with the smaller diameter, I had hoped that if there was a tightness that the 2.6 would get around that, but the M3s are fine, so no idea what it was.
Settled for cutting down the M3 x 45mm to size, the thread goes a little further inside the arm shaft, but it doesn't bind, job done
Since taking the picture I moved the camber link back to the inner hole as forgot it was there from before when I re-assembled it
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Have fitted the upright antenna tube, so just need to figure out where to drill the hole in the bodyshell, might take some ingenuity
Once that's done it will be time to get it back out and re-adjust the settings and then get some running vids up