Something has gone amiss with the chuck on my ageing budget SDS drill (Ferm
FBH620 from Screwfix many moons ago): tools no longer twist-and-lock.

I've seen fixes online but the prospect of dismantling the chuck doesn't
really appeal. A quick test has revealed that the tool still works
perfectly well as a chisel (which has always been my main need) except for
the inconvenient fact that the bit keeps falling out.

Is there any reason why I shouldn't take my most-often-used chisel bit and
simply stick it in the chuck? A spot of Araldite or even superglue on the
very end ought to hold it, oughtn't it?

Many thanks.