Keck-handed

D'Oliveira and Barbirolli smiled elatedly as if handing on a bat or a baton, unaware they'd bestowed their attention on a keck-handed, tone-deaf imposter who wasn't collecting signatures anyway, who just happened to be standing in the right place and was then pushed forwards with a pen and paper.

The amateur who can handle ordinary carpenter's tools and is generally dexterous has a very definite advantage over one who is unpractical and keck-handed.

In the upshot, it looks like equal numbers of right-handed and keck-handed.