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@DFP
I have on my bike, what I perceive to be good quality shifters. Ultegra downtube 7 speed, but in friction mode to operate my 8 speed cassette.
I thought it worked perfectly, that is until I went somewhere with steeper hills. I found whenever trying to get up a hill and therefore putting more force through the drivetrain, the cable would pull the shifter back down, therefore downshifting from the biggest sprocket down to smallest ones.
The shifter itself seems in excellent condition, and shifts perfectly. Doesn't budge either unless trying to attack a hill.
What is the problem here?