Ruger Double Action Revolvers Quiz!

I am semi-retired and I am taking a self-passed and self-taught Armorers course and now I am on the Ruger Double Action Revolvers. I hope to become a part-time light Gunsmith in the near future.

There are over 60 quiz questions covering this firearm and I have answered most of them hopefully correctly but during my study and research I am having some problems related to some of the following quiz questions. I have conflicting answers.

Can you help me determine the correct answers for these few quiz questions? Please correct my wrong answers!

Thanks for your help.

Note #17. The revolver could fire without the transfer bar by simply pulling the trigger. True or false

Note #18. The spring and plunger for the cylinder stop (cylinder latch) spring loads the cylinder stop (cylinder latch)
a) up
b) down

Note #19. The crane has two balls that retain the cylinder. True or false

Note #20. The center pin system utilizes a
a) right hand thread
b) left hand thread

Note #21. The trigger is also the sear. True or false

Note #22. The hand (pawl) is not spring loaded. True or false

Note #23. The cylinder must go into the frame before the trigger guard assembly. True or false

Note #24. What is the slave pin that is supplied by Ruger used for?
a) To captivate the mainspring
b) To install the trigger
c) To take off the front sight