You should probably just start over. The down hole part is probably in as bad a shape as the above ground stuff.
Make sure the pump has a good check valve or install another right on top of the pump.
Change the 2" down hole pipe for 1" or 1 1/4".
Get rid of the "claw" and get a proper 4X1 or 1 1/4 well seal.
Eliminate the 2" compression fitting and use a proper union of the right size.
Move the pressure switch to within a couple inches of the tank and put it on a tee and remove that check valve it is screwed into now.
Check the air charge in the tank and the pressure switch setting.
If the tank does not hold air or even just because this is the perfect time to do it, you can change to a constant pressure system, which will give you better pressure and keep problems from happening in the future. It would also be able to use a much smaller tank and make the plumbing easier.
If your tank is still good adding a CSV1A would look like this. (pic from a customer)
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If the tank is no good you can replace it with a PK1A kit, which would look like this. (pic from a customer)
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