crowd views great Leroy magic escape; hangs from neck in cuffs; workmen help Leroy hang, test noose CU; CU Leroy signs waiver of responsibility;CU handles chains, cuffs; CU man helps Leroy put cuffs on legs, wrists; CU woman, man 'check' cuffs; CU Leroy displays cuffs; woman puts noose around his neck; crowd watches him lifted into air, he spins; gyrates in front of sign MANHATTAN PLAIT, removes cuffs, descends past signs SUITS and KIRKMAN'S BORAX;