dealdan

Hello folks,I recently bought a hilti TM-7S VSR hammer drill in a pawn shop. I only paid $20 so I figured I wasn't loosing too much. Everything seems to work but the chuck is shot. My question is, what would be a good replacement chuck? Is there anything special about a chuck on a hammer drill vs a regular rotary drill? The original chuck had no brand name on it and it uses a 1/2-20 threaded shank. The capacity was 1/2"