I have been having problems with my LOWER blade holder all of a sudden.   I cannot get the holder tight enough to hold a 2A spiral blade or smaller.  They just become loose.  I have tried everything.  The plates do not show wear.  I have used these blades in the past without too much problem, but sometimes, they loosen up and I have to retighten them. I dip the ends in mineral spirits to get ride of oils on the blade and have even toughed sandpaper to them with no improvement.  Has anyone had a problem???.  I have a quick release for the TOP and it works great, it's just the bottom one.  I tried to get a quick change for the bottom, however, they said they did not make one for this particular model because there is not enough room for it. 

please help...help...help!!! 

 

Thanks in advance

 

Ron