Levelled the fuselage with a spirit level, then straightened and levelled the tailwheel steering mechanism. Pinpoint drilled the spring for the AN3 bolts, the removed the spring and drilled through on the drill press using the "centre-it" guide. Replaced the spring and drilled the final socket hole, the reassembled with one temporary retaining bolt.
I plan to replace the steering arm with the Silver Bullet parts from Rivet Head Aero - if they ever fulfil my order (after five weeks) - they're not answering my e-mails at present.