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This photo of Arnold Schwarzenegger and Franco Columbu was taken around the time Schwarzenegger was preparing for one of his Conan movies. They were likely either assisting friends with a construction project or just posing for the camera as it’s very unlikely that they were doing construction work at that time to make ends meet.
Schwarzenegger and Columbu apparently laid bricks professionally, at least to some degree, in the Santa Monica or Venice area when they first arrived in the United States. It is not clear how many jobs they actually did. Both had other sources of income at the time as well as being under contract with Joe Weider.
This was just a stunt, a photo op, iron brother.
You’re right. The real carpenters are standing behind them.