I had an older Hegner (single speed) and swapped the blade locking bolt for a knurled knob, akin to what the later Hegners run. It worked great for speeding up upper blade mounts and dismounts.
As long as the hex screw on the opposite side is set right, the knob, coming in from the other side, locks the blades at center.
I sold the older Hegner and ended up with a newer, variable speed unit with the front tension release. In the course of looking up info on the newer one, I learned about the flip system for the back tensioner PaulDoug mentions. It beats having to adjust the knob every time you want to release tension.
I believe you can swap the arm too, so you'd get the front release.
Remember, you're playing with a saw which, new, is over a grand, vs the Delta. As such, a quick release on top and a better tensioner may be well worth the money. In the end, put it up on the market for five hundred and see how quickly people jump to get it.
In between the older and new Hegner, I picked up an RBI for a couple hundred. Sold it to my friend and used the money toward the other Hegner, when it became available. Add to this fray, I had a Delta I gave away. When it's all said and done, the Hegner is, by far, my favorite. It runs smoother, and getting to the lower blade lock was much easier.