Just to add to greywether's folklore - not that I'm encouraging vandalism but it won't work just any hour of the day.
Into it [the Toothie Stane, the large outer portal stone] have been driven at least two dozen nails or screws. Local legend explains these by saying that it used to be the custom for anyone suffering from toothache to seek a cure by driving a nail into the stone at midnight!
I am indebted to Mr S. R. Skilling [for an account] of a rather similar superstition from SW. England, to the effect that an aching tooth could be cured by hammering a nail into the trunk of an oak tree.
The excavation of the chambered cairn at Brackley, Kintyre, Argyle. JG Scott, in PSAS 89 (1955/6).
The track to the left of Tigh Chromain climbs steeply up hill (who'd have thought it, eh?) until - upon approaching the farmhouse - I see, or more accurately 'hear', the farmer working the fields in his tractor. Waving him down, he readily agrees to me taking a look at the site. Excellent.
The monolith is a beauty, the coastal views towards Gigha and Cara (like a sea monster making its way up the Sound) exceptional.
The chambered cairn has been badly dealt with, but a few stones still remain in situ... and of course there's that view! Incidentally the fence is currently 'step-over-able', so to speak, so no need to descend/re-ascend.
The icing on the cake is the remains of a dun at the southern end of the ridge (beyond the monolith, that is). Great stuff.
Visited May 08 in blazing sunshine...... the farm track entrance is difficult to spot - I went racing past (well, as much as you can in an old Rover 45 - Right on!) before it dawned on me that the barn with the red roof was 'the one'.
Parked up the road in a beach lay by (of sorts) opposite Taigh Sona and walked back along the A83 to the site. Three superbly-proportioned monoliths and a perfect, diminutive little chamber stand on the side of a hill overlooking the Sound of Gigha.
The farmer arrives, I assume to check me out, and tells me that after 30 years or so he finally checked out the Mid-summmer sunset to Cara Island last year. Great bloke and a reminder not to succumb to belief in stereotypes..... hopefully he left with the same impression.
The swifts dart in and out of the nearby barn, the lambs do what lambs do and the ferry to Ghiga slowly crawls across the horizon. Not much happens at Ballochroy. Isn't that great?