[Removing the blade on a DW402 to install a new one.]

Thanks, I'll give that a try.  I didn't even try turning it that direction, 'cause i didn't want to tighten the bolt but it's worth a try.  I work for a Christian camp and they decided to buy a new grinder but I kept the old one just in case I ran across something I could try.  Thank you again. 

[Removing the blade on a DW402 to install a new one.]

I am having trouble removing the blade on my DW402 angle grinder.  There is a button on the top to hold the blade in place but it only holds the blade in place when turned clockwise.  It does not seem to hold it still when I turn counter-clockwise, which I thought is needed tor remove the blade.  I tried multiple different ways to hold the blade in place while I used a socket to undo the blade but was unable to remove the nut holding the blade tight.  If you know a trick I haven't tried or can help in any way it would be appreciated.  Thank You