Loose crank arms
When riding my Puch, I've been experiencing a "slip" while pedaling. I took it into the shop and they were not able to reproduce the slip, but they did rule out the bottom bracket as a cause. The chain and cassette are new. The mechanic thought it was possible the freehub was worn, specifically the paws, but as that is not serviceable, it can't be disassembled to see. After I got the bike back, I rode it about 17 miles and could feel no slip. Now, I'm wondering if perhaps the crank arm bolts were loose and that was the cause of the slip. So I returned to the shop and asked if he could check them. He said that as a matter of routine, that was one of the first things they would check. But he checked them again while I watched and they were tight. So I'm wondering- would loose crank arms cause that slip?