There are images showing how to recock the hammers with the gun disassembled in the LCSCA FAQs
Look under "How can I cock the hammers when my Smith gun has been disassembled?" in the Disassembly and Reassembly section
https://lcsca.clubexpress.com/content.aspx?page_id=274&club_id=43784

It is very likely the internals of the action needs a good cleaning, which, done right, requires removal of the stock.
If your friend has not previously reassembled a Smith, it's best to let a gunsmith do so (and while he's at it check the head of the stock for cracks).
There are however images of several reassembly techniques on the FAQ.

https://sites.google.com/a/damascusknowledge.com/www/home