Definition of "fiddling"

[W]e, her doctors […] seemed powerless to prevent [side-effects], despite all our reassurances, and all our fiddlings and manipulations with the dosage […]

1973, Oliver Sacks, Awakenings

Was it deliberate that the first week of October 1961 was chosen to conduct a national survey of passenger usage? Why October of all months, when the holiday season was over and families back at work and at school? Was this a fiddling of the figures to make an unfair case against rail-dependent resorts such as those in the West Country, Norfolk, Lincolnshire and East Yorkshire, where previously overloaded summer services would now only have a handful of locals on board?

2023 March 8, Howard Johnston, “Was Marples the real railway wrecker?”, in RAIL, number 978, pages 52–53