rod bearing

i just wonder how many people here have put bearings in while the engine was still in the car?
...yes, it can be done...yup, main bearings too!
how? (u say?)
verrrry carefully.
i learned it from an old mechanic, back from the early days before tri-metal bearings when they wore out and needed replacing much more frequently!
he also taught me that an iron nail and a corncob can be a sparkplug on a Model T...yet i degress