Excellent used a square end of a wooden chopstick and nudged the copped flange forward ever so slightly forward towards the muzzle end and Perfecto ! No click and nice and smooth single action.

I had to run out to my Gunsmith and tell him forget i figured it out give me my gun back, he wasnt even going to look at it until Saturday so i saved some money and he probably didnt even know what he was going to do.

Thanks all excellent info and knowledge. left Holster finally showing up tonight and ready to carry my 4506 again WoooHoo