Hi not sure if this is the right forum but, i can't seem to drill any further into this brick i have a hammer drill and am using an sds drill which, so i'm told, is designed for use with a hammer drill, i have only used it on 4 holes and this last one is really struggling, idealy i wanted to fit a glass shelf with 32mm screws but can only get this last hole about 25mm deep, should i just give up is victorian brick always so evil to drill?