I bought a TC Hawken flintlock tonight at an estate sale. I pull the hammer back to full ****, pull the set trigger, then squeeze the front trigger, the hammer stops at the half **** position, and the flint does not strike the frizzen. But if I just ignore the set trigger and squeeze the front trigger at the full **** position, the hammer falls all the way forward, and the flint strikes the frizzen. Does anyone know what’s wrong? And how do I fix it? Thanks