I wonder if the red stem is any different to the black.
I think they are identical...I mean, same. see the picture in Black on Brown thread again.
Just for comparison, I put a picture of stems ( blue, brown, black )
Total lengs L1 and L2 are basically same. but there is a free space L3 in blue. white part with leg( twig? how do you call? ) of blue stem just moves upward without pressing force from switching leaf for a short period when the stem is pressed . while brown stem receives pressing force from switching leaf from beginning when the stem is pressed.
this causes the deference of pressing force from 0mm point to pressure point...so I think.
xsphat, I'd like to say sorry in advance for my piece by piece observation.