Originally Posted by
Aubergine
Scorpiox, there was a recent thread about Miyatas that had internal cabling, and cracked at the holes because the holes had no reinforcements.
The simplest answer IMO would be to get a quick-release seatpost clamp so you can extend the seatpost when you put it in the workstand. You can also get a small band to clamp around the seatpost at the edge of the seat tube, so you can re-insert the seat post at the same depth.
You beat me to it. I had a c-worker in the '80s who broke a string of those Miyatas at the hole in the back of the top tube. Miyata kept giving him new frames, usually a step up from the last, with the same drillings. A year later he would be waiting for his next one.
Ben