Actually from Tyndrum we now prefer the A85, and A828 coast road, which rejoins the A82 at the bridge at South Ballachulish.
You will pass where I worked for 2 weeks for Nuttal's in the tunnels for the hydro-electric pipes. The scaffolding failed in the shift just before ours killing three men. We left the work immediately after! You'll also pass Anderson's piano, a signalling system for detecting falling rocks.