Rowland
do not go for an engineering bearing fit with the Tufnol. I once took of
after a cold night (in the hangar) and the weather had warmed up a lot.
The metal parts expanded a lot quicker than the Tufnol did and the
controls were stiff for the first hour or two, then loosened up.
There are two problem points as Ron says, the axial clearance which is
best set up with a tissue paper washer, torn out after cure.
The radial binding is sometimes due to the CS02 fork end not being
coaxial with the torque tube, because of the clearance needed to get the
Redux in. If the Tufnol block is also not coaxial it will bind when the
torque tube rotates.
If you inserted thin wire splines of just the right thickness (1/2 the
clearance, whatever that is, that might work
Graham
rparigor@suffolk.lib.ny.us wrote:
>
> Hi Rowland
> Anyway that black grease expanded the Tufnal. I for one would not put any
> grease on Tufnal unless you know for sure that the selected grease over
> years and years will not expand Tufnal. Not only did the Tufnal expand and
> make a smaller ID, it got thicker and was binding in thrust as well!
>
> If cockpit module were installed and bushings expanded, you could probably
> lap a better fit in place as I described after a bit of surgery and
> repair. You would however make a mess beyond belief!
>
> BE CAREFUL WITH GREASING!
>
> Mine may get a quick spray of the teflon aluminium spray once every few
> years.
>
> Ron Parigoris
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