Last season Claudio Ranieri finally kicked the habit. There was simply no need to tinker. Leicester had an alchemy and his job was not to spoil it.
This season Leicester are spluttering and Ranieri has succumbed to the temptation to tinker once more.
On his return to Chelsea, where he will always be fondly remembered as the Tinkerman, the first manager fired by Roman Abramovich, his tactical tweaks had no impact.
In fact, they served to emphasise the steep decline of the champions who ended their last glorious season on this ground in May.