Hi KingofKoopas +
this post is about my understanding parts and my NOT-understanding other parts of the collecting bonus feature. I hope You agree with my "understandings" and I also hope that You can help on my "not yet fully understanding parts of the feature".
On the lower part of the JPG I see "I-Bonus-Score-Relay actuated" makes the L-1000-Points-Relay to give 1000 or 2000 or 3000 points to the Score-Drums. Giving points only can be done in the FIRST (and 2nd and 3rd) closing of SCM-1A (Score-Motor-Switch-1A, within a turn of 120 degrees: The switch is closed 5 times).
The marked "rosa / pink" stuff shows: The "rushing through the Bonus-Positions to find a position with a dropped target" is done fast - on every closing of SCM-1A and "J-Relay not actuated" and I-Relay not actuated". The detection of "position WITH dropped target" can happen on ANY closing of SCM-1A --- so sometimes the feature must pause so the Motor can turn - motor comes to end of turn and with / in the next turn: The giving points (L-Relay) then can be done on 1st (2nd 3rd) closing of SCM-1A.
On top of the JPG - my big black question mark: I believe this switch is to keep the C-Relay STAY pulling --- the rivets on the bonus-unit hop from one position to the next position --- and "my question mark switch" makes the relay stay pulling for the short period of time "hop-has-no-connection" (?).
"Marked light-blue" - The I-Relay is made pulling very late in a turn of 120 degrees - the SCM-2B closing (and the J-Relay pulling) activates the I-Relay (at the very end of a turn) - then the next turn the I-Relay can make the L-Relay to give the points to the Score-Drums (closing 1st and 2nd and 3rd SCM-1A) - the 4th closing of SCM-1A has nothing to do with the I-Relay but then just after: The actuating of (dark-blue) SCM-3C lets the I-Relay drop-out.
The mentioned "4th closing of SCM-1A" is at the same time with "closing of SCM-1B" - the Bonus-Unit is stepped forward one step - to eventually get to the very next position with a dropped target to start the stuff (start by actuating SCM-2B) again.
"Marked lemon-green": The J-Bonus-Score-CONTROL-Relay is allowed to pull-in ONLY / AFTER the I-Relay has finished its duty - THEN the J-Relay can pull-in.
"My lemon-green question mark": I believe to understand that the switch is needed to finally make the J-Relay quit pulling --- but I am confused about it and I also
am confused about parallel / semi-parallel off-set / sequence-succession on actuating / stepping J-Relay / I-Relay / Bonus-step-coil in combintion with "rushing through the positions (Bonus-Unit). Thats why I suggested (post-42) "Test-Lights for to show actuating stuff" visible with Score-Motor turning at the same time --- to see the pattern on "mostly working feature" - realizing what causes the fault.