dahaku

Hello, I purchased the 24" laserpoint cutter, but my blade holder does not seem to fit right. I am able to fit the blade, then when i place the blade holder into the cutter, it seems as if it is too large. I am not able to "force" the silver screw together enough to grab the thread to hold it in. It does stay, but it looks as if it will break. See pic.. Does not look like the other pics i have found online...HELP, as i do not want to have it break soon...