The new Miyata seats are simply inferior in every way. The plastic feels different (softer) and pulls in a much cheaper way, the vinyl cover feels thinner and looks and seems less sturdily constructed, the baseplate engineering has run the saddle down the quality pole, etc.etc.etc.
It would be rare that coloring the plastic would affect the strength very
much, especially if the color is light. On very dark shades it would be
possible to put too much color in, not notice a difference, and degrade the
Crappy material could come from purchasing reground material from another
product line. There may be a kid toy out there somewhere that is high sales
volume and has the same shade of color as these seats. If there is a
mistake in molding that toy, then it is ground up and molded into something
requiring (presumably) less strength.
I think the problem is in the design of the corner; not enough radius. They
could fix it in the mold.
The Frankenstein bolts are a great work-around.
“Jason” <firstname.lastname@example.org> wrote in message
> I have a question for anyone who works with plastic. Could the coloring
> agent used in the plastic change the strength properties of the Miyata
> I am wondering if all the folks who have torn their Miyata handles can
> report the color of the handle, so that we might make a correlation?
> For me: Blue