trimmer spool doesn't move

I have a black and decker weedeater (I think!). It's the basic trimmer and edger, corded, runs from an electric outlet. It has a trimmer line spool that you have to wind every so often. Of late, the spool is not moving forward. After winding the spool, I leave out about 2 inches of the wire to get it started. Once it uses up that 2 inches it's supposed to move forward. Well, it's not. It just stops because the spool doesn't feed more line out. So I have to re-wind it every two feet of edging.
I'm winding it just like I have always done. Does any one have this problem? What did you do to get it working again.
Thanks.
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If they make a pre-filled reel for your machine get one and try it to see if it will work. If it does, you are probably not winding your line correctly.
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I already did that, and still have the same problem.
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In that case I would scrap the unit and buy another machine.
At the start of this summer I bought a battery operated self advancing unit and it was the best move I've ever made as far as lawn equipment is concerned.
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