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What an absolute simple yet effective design, has been in daily use for the last 7 months!
Thanks @Schlotzz
The idler arm has eventually broken BUT I was not even using it with a spring, just a careful amount of tightness on the adjuster screw, was printed at 30% infil at 0.2mm layer.

Highly recommend printing this part in solid PLA which only add a few minutes and will probably last the lifetime of the printer :)
Will be fitted with a tension spring this time when I rebuild it, FYI, use a 4mm drill to clear out the filament exit (top) port then insert a small section of PTFE tube to run against the Bearing/Mk8 wheel which will be held in place by the tube connector, this allows for perfect use of Flexible Filament! without any chance of wrapping around the Mk8.