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Doug,
    I don't know about the hydraulic filter.
    However, I used putty on the screw fitting to the hydraulic cylinders.
The main gear cylinders both developed significant leakage.  I then used three
wraps of teflon tape behind the flare and they held pretty well.
    I have also recently developed a large leak past the "O" ring in the nose
door cylinder.  I got the o-ring kit from Lancair and replaced the three
rubber pieces in that cylinder but have not tested the fix yet.

Bob Chesley
L-320 Builder (moving the a/c to Camarillo on the 14th!)
Ojai, CA