The Merkur HD which I bought for my Father a few years ago has broken. I think the thread inside has gone. It nearly gave him a nasty cut. I thought the HD would last a lifetime but clearly not. I've let him borrow my nice Gillette Slim handled English Tech for the time being. Perhaps I should just give it to him. I still have a Gillette slim adjustable 1964 which I intend giving to my son when he's older. I'm using an Ever Ready 1912 single edge.