On Nov 26, 3:00*pm, Andy wrote:

Did you consider using a mountain bike hydraulic brake lever? *Perhaps
they were not available then.

Yes, I tested a promising one at the time. As little displacement as
my Cleveland caliper requires under typical conditions, it still took
a couple pumps of the lever before it pressured up.

Is the mass of the lever even significant compared to the mass of the
pilot's hand and arm that are also usually, and certainly during a
PIO, *attached to the stick?

Not known. I do know that the available hydraulic master cylinders
with attached reservoir are around a pound or so. I also know that the
human hand and arm has a lot of inherent damping, and also that only
about half the mass of the forearm counts as sprung weight. In this
case at least I decided to develop conservatively and move on.

Thanks, Bob K.