Fisco Industrial Supply perhaps?  They're in San Diego, CA.  Here's a link to a Delta "Quickset" but I'm not sure it's the right part for your application

 

 

Hope it helps.

 

Andy

Ron, I believe the 40-640 is the same model as I had where you need the special tool to open and close the bottom clamp. There is not room enough to install the Quickset clamp on the bottom on that saw. Thus you can only bottom feed. I sold mine and purchased the Delta P-20 3 years ago and really like it. I used the old one for 11 years. I liked it accept for that bottom clamp, I never had any problems with it.

 

 

Mick,  Delta- P-20 

Thanks Mick

 

At least I tried to make life easier.   Andy (thanks Andy) gave me a link to Fisco Industrial with a quick set, but it was for a smaller saw and wouldn't fit.   Thanks for trying guys.

 

Ron