Possible stupid question warning! Changing the roll on my ReefMat 1200 for the second time... The first time, it was a real battle to get the dirty roll off, as I installed the new roll and examined the two oval bars, assumed I just wasn't doing it right! Now the second time around and I'm stuck again; the roll is wrapped so tight, I can't get the two central bars out, no matter how much I try to force them! Have I missed something? Is there a proper way to do this? I can't find anything on here, YouTube or Google - It must just be me!