Every time I have the tracking on my car sorted, the tyre people only seem to be able to get my wheels tracking straight with the steering wheel off to the side. How hard can it be to do it right first time?
That is poor service & inept.
I do 4 wheels on my car at home using the string method (well strimmer line, rather than string), cheap and accurate. Always pays at the front to centre the rack, then centre the steering wheel in case some div has tried to correct wheel position by moving the steering wheel round a spline then when that is all central, locking the steering wheel in the centre ahead position (garages should do this as well) before undertaking alignment.
also do camber using same sort of technique