PLEASE TELL ME I NEED FULL ACCESS BONDER

this solution was easy to make, which scares me.  Either true MechA is < 6 or this is an area race

MechA must be 6 though.  1 for the arm base.  1 for the input.  1 for the output.  1 for the QS output of the rejector (single atom).  2 for the bonder because the only way to get multi-atom intermediaries in this puzzle is bonding, and with only single atoms full access bonder is forced.

i feel like this puzzle is MechA specifically rather than cost so a piston can be used instead of a single arm, but i haven't been able to get my piston solve to not crash.  No matter what i do the partially assembled output seems to *have* to crash into the metal that's being rejected.  Maybe something with syrup tech to move around that catalyst?  but i can't wrap my head around that and it's the day before the deadline.