Hey Brian, Your right, there is no stop to keep the blade from falling out of the bottom clamp. The trick is to mount the blade in the top clamp first! If you are a top feeder, this comes naturally. One important tip. Remove the guard that is in front of the lower blade clamp. It's there to protect your fingers if you reach down there while the saw is running, So don't reach down there while the saw is running! Removing that guard will make clamping easier.
As for the Jim Dandy easy lift, I used to have one on my saw. Since I top feed, It was just in the way. I took it off and chucked it years ago!
Google Jim Dandy easy lift, You will find where to buy it.