Looking for a gunsmith to install a replacement, 2 piece, Magazine throat "the plastic piece at beginning of tube" on my early production Winchester 1400. I took it all apart to clean it, found that it was broke (cough cough, after I hit it wrong, cough cough) and I think it would be best if I had someone else put the new one in. I already found one and have it on the way. Any one have any recommendations or has done it before?