How do i fix the lens on my cyber-shot 7.2??

How do i fix the lens on my cyber-shot 7.2?? The lens only comes out 1/3 of the way then makes a horrible grinding noise like the cogs aren't connecting or something. Can this be fixed within the price bracket of buying a new one?? It broke a little while ago and because it wouldn't open i pulled the lens out now its decided to fix itself less the bit i pulled out.