Since I have no miniature reusable explosive bolts I figured I had to come up with something different for the ascent stage attachment points. After some thinking i decided to build a simple rotating lock. Problem is that there are four attachment points. so Im starting to build a mechanism that make them rotate in unison. I will probably let this mechanism be controlled from within the MESA compartment. pull one string to lock and another to release.
Leaning towards putting a spring in there so that it always goes back to a locked position. Then I could use the Mesa deployment handle to release the ascent stage instead… The only problem with that is that if the mechanism fails it might be impossible to lock the ascentstage.