Can't believe how hard cement render is on the inside of external walls - gotta get me one of those SDS drills!
In the meantime, the conventional hammer drill does get through it with a little effort. However, this time the chuck has jammed and I can't remove the 6mm drill bit that's in it.
The chuck itself is a decent keyless Rohm chuck, but one of the ones with the plastic cover on the outside (much prefer the knurled metal one on my cordless). There is a hex "nut" on the front to accept a spanner, and behind it the spline is flattened on each side so that a spanner can also be used.
I've never noticed before, but does the front nut on these turn when opening the chuck - ie so I can free the chuck using a spanner on this and one on the spline behind, or should I be emplying another method to free it?