Only ever use Lee Oskar harps, they're just better made than Hohner diatonics, no space for hair entrapment - also they sound better and last loads longer. AND the plastic comb doesn't snag your lip the way wooden combs can. AND the seal's better for blues playing. AND you can buy replacement reed plates quite cheap. Pity they don't seem to make chromatics...
Good luck with the Blues King... Who makes them