I have a Performance Power Tools cordless grass trimmer which has run
out of line. Its been so long since I last did it that I cant remember
how to take the old reel out. The only screw I can see is to hold the
protective shield in place. I cant see a screw on the shaft to hold the
reel in place. I've tried pushing & twisting but the bugger wont come
off. I know its got to be something simple but I'm generally a bit
clueless so...

Any suggestions please?