It is almost certain that your compressor lost more than just a bearing. When the freeze up they have failed internally and scatter metal debris throughout the entire system.

In the case of compressor failure, flushing is not the word for it. You need to break EVERY connection in the system and COMPLETELY flush EVERYTHING. Flush it forward, flush it backward, then follow that up with a flush both ways. Then once you're through with that, then flush everything, and follow up with a THOROUGH flushing. Are you getting the picture here?

If you DON'T flush, and flush and flush and flush THOROUGHLY, it is almost a complete certainty that you will lose the new compressor. You also should contact your local auto a/c supply and see what they can offer in the way of a suction side filter. This is a filter that you can put inline very near the inlet to the compressor. If you can do this, you will still need to flush, but it doesn't have to be so exhaustive.

A byproduct of flushing is that you will remove all the oil from everywhere, thus you can get the correct amount back into the system. I think you will find that it calls for 6 oz. Put 2 in the evaporator, two in the condensor and two in the compressor before hooking everything back up with fresh o-rings everywhere.

Make SURE that you get ALL the flushing agent out of the system and remember that the system has been completely opened and MUST have a new r/d replaced as the last item after closing up everything else. And do a THOROUGH evacuation before charging it.

You are very wise for staying with R12.

Hope this helps,