According to my investigation, it depends on the casino, the country, the kind of machine, etc. It appears that operating the machine only requires changing the chip or the weight on the reels. The casino might change the payout in one of these scenarios.
If the casinos do, there will be documentation to complete, including notifying the appropriate gaming authorities of the modifications.
If the casinos do, there will be documentation to complete, including notifying the appropriate gaming authorities of the modifications.