New DS1 Owner - General Questions

Hello! I recently purchased a 1966 Daysailer 1 and have some general questions. This forum and the association website have already been an invaluable resource, and I appreciate your time for my first post.
I have 4 questions to start here - I could not find anything about these on the forum so wanted to ask directly. I will be referencing the photos at this link, which are labeled.
https://drive.google.com/drive/folders/1Y5bTsZINihcs2O0e7ps4HZ-shVUdyZj-?usp=sharing
1) Mast 1 and Mast 2 Photos - while I understand a tabernacle setup, this seems like something different. There is one small pin that holds the mast pieces together, and it is very wobbly in its current position. I am sure she will sail fine once the mast is stepped and the stays are tightened, but I am very confused by this type of mast hinge. The DS1 original manual does not reference this so it does not seem stock. Plus I will be storing the boat on a mooring so I am concerned about any "slop" movement.
2) Mast Jack Photo - I understand how this piece works however the baseplate that the circular jack part sits on "hinges" on the bolt. The bolt hole looks like there is forward/aft adjustment and maybe has gotten larger with time. Is this standard? Want to make sure this is safe or regular as I have not used a mast jack setup before.
3) Wooden Blocks Photo - There are 4 wooden 4 x 4 blocks behind the seats, 2 on each side. Are these supposed to be there? Seem oddly placed. The aft 2 seem to not move but the forward 2 have a big of wiggle room.
4) 4 Holes Photo - See 4 mounting holes just forward of the rear two cleats, any idea what would or should have gone there?
Thanks in advance!
I have 4 questions to start here - I could not find anything about these on the forum so wanted to ask directly. I will be referencing the photos at this link, which are labeled.
https://drive.google.com/drive/folders/1Y5bTsZINihcs2O0e7ps4HZ-shVUdyZj-?usp=sharing
1) Mast 1 and Mast 2 Photos - while I understand a tabernacle setup, this seems like something different. There is one small pin that holds the mast pieces together, and it is very wobbly in its current position. I am sure she will sail fine once the mast is stepped and the stays are tightened, but I am very confused by this type of mast hinge. The DS1 original manual does not reference this so it does not seem stock. Plus I will be storing the boat on a mooring so I am concerned about any "slop" movement.
2) Mast Jack Photo - I understand how this piece works however the baseplate that the circular jack part sits on "hinges" on the bolt. The bolt hole looks like there is forward/aft adjustment and maybe has gotten larger with time. Is this standard? Want to make sure this is safe or regular as I have not used a mast jack setup before.
3) Wooden Blocks Photo - There are 4 wooden 4 x 4 blocks behind the seats, 2 on each side. Are these supposed to be there? Seem oddly placed. The aft 2 seem to not move but the forward 2 have a big of wiggle room.
4) 4 Holes Photo - See 4 mounting holes just forward of the rear two cleats, any idea what would or should have gone there?
Thanks in advance!