The "BEST" Lift Arm for the Dewalt DW788 and the Delta 40-690 scrollsaws is called the "Click-N-Lock" and it's sold by BigFoot Products Canada for $24.95
They are in use Worldwide.
Features:
One Finger Operation
Just replace 2 bolts to install it
One piece Laser Cut Lightweight Acrylic Arm with a LIFETIME Warranty.
We encourage everyone to compare and make your own decision.
You can watch the Video and order it here : http://www.bigfootproducts.ca/Click-N-Lock.html