Why not simply replace the chuck? Several companies provide spare chucks for purchase, including Topeak, Silca, Hirame, and so on. Some of them come with multiple adapters to fit whatever hose you have, and some of the above companies also sell new hose kits with adapters to fit your particular pump. I have an old Rennkompressor whose pump head finally fell apart. I bought a Topeak hose kit with the smart chuck and one of the adapters fit my pimp perfectly.