Thing is, rightly or wrongly, and truthfully or not, duff work in these cases always gets blamed on the "mechanic that no longer works there".
It's an anonymous, silent scapecoat which is often used for black bag carpet sweeping exercises.
Not saying this is what old Thorney has done here mind.
Indeed, the ex-worker is a constant theme running across a lot of club forums- even Gibbos bad experience was blamed on the new guy too.