After Sarrance, take the road through the Gey valley to its end point beyond the Gey farm. Do not block the turning bridge.
(S/E) Follow the path along the hillside, which descends at times, to a first footbridge.
(1) Ignore the climb towards the Lahouratate house and follow the river (ruined house).
(2) Reach a second footbridge and continue up the valley to an easy ford.
(3) The path is now better signposted (yellow markings) and winds its way up to a ridge at the Maute house (ruins).
(4) Head back down the same way to the Gey farm (S/E).
I walked this route 25 years ago, but the path is now closed after the first footbridge.