Ah, that typical British expression, 'fiddling'.
Loosely translated, it actually means, precise positioning, adjustment and spacial evaluation, followed by copious additions to the contents of the Oxford English Dictionary, culminating in the permanent fitting of wayward small parts into, or onto, the previously evaluated locations, in such a way as to render their appearance to resemble the actual perceived appearance, but not as the designer or manufacturer had intended or instructed.
A fine example of using one word (in this case 'fiddling'), instead of a multitude of meaningless words !