Not one to be given the runaround, local dad Mark Shawsky, 56, made sure to really hold a Best Buy sales clerks feet to the fire while inquiring about HDTV accessories, sources confirmed Sunday. The double-shielded wire is going to give me the best resolution, right? So Im not going to get home and find out this HDMI cord isnt the right one to hook my TV up to my Blu-ray player? said Shawsky, decisively demonstrating to all within earshot that he was neither a fool nor some know-nothing off the street who could be taken advantage of. Im pretty sure this is the right one, but I want to know if you know. Youre supposed to be the expert. I should get the double-shielded wire, correct? At press time, sources reported no onenot even Mr. Fancy Blue Shirtwas going to slick-talk Mark Shawsky into a bad purchase. 