I have to admit it... I never once gave it a thought before, but today I was cleaning a late 60's PX-10 frame and noticed that there was blockage about 8" down the seat tube. I shined a flashlight down the tube and even poked a long rod down there and sure enough it ended.
It's dark down there and there is a slight amount of corrosion, so I can't exactly tell how it is constructed. I am assuming that it is designed to prevent objects or water from getting down there... and not that I have a foreign object stuck in the tube...?
Any one know how the seat tube is designed? Anyone have a diagram? Am I nuts?
Now I am going to have to take all the seat posts off all of my bikes to find out if they are all made this way or if this is unusual. Anyone know so they can save me the trouble???
