Travelling from caernarfon towards the LLeyn on the A499 you take the left turn at Aberdesach. Opposite the left hand turn is a stone built bus stop and a phone box.
The chamber is clearly seen from the road, it is opposite the entrance to Penarth farm caravan park.
I agree it would be great to see this restored. It is a lovely chamber and the setting is great.
I spoke to a chap who was sat on the top of his caravan and he said that the farmer is happy for folk to visit at anytime.