As part of a walk in the Alpine National Park in Victoria, Australia, from Pretty Valley near Falls Creek across to Hotham and Feathertop and return, I recently (March 2006) walked from Mt. Feathertop via Diamantina Spur to Weston Hut. My guidebook did not cover this section so I'm posting some information that might be useful.
The maps show two paths giving access from the Razorback to Diamantina Spur, one to the south of High Knob and one to the north. The southern path seems to have vanished, but the northern one is clear and signposted.
The path down Diamantina Spur is occasionally indistinct, but it follows the ridge line closely and we only had to cast around for it a couple of times, and only briefly. It's very scenic, with great views of Mt. Feathertop. The drop off the last knob is the only difficult bit, a steep scramble taking twenty minutes or so. It's nowhere near a technical climb but it would be horrible in wet weather.
Contrary to one of the maps, the path bears right at the last knob and emerges onto the fire trail about two hundred metres north of the bridge over the Diamantina River. There is a signpost on the fire trail, and marked trees up the spur for a while.
The spur has no camp sites, and no water. A small party could camp comfortably at the bottom beside the bridge over the Diamantina River, or you could walk on to Blair Hut.
Those proceeding to Cobungra Gap or Machinery Spur should be able to follow the fire trail with no problems. However, we went to Weston Hut, and we had a few worried moments negotiating the little mess of trails around Blair Hut. We saw no signposts in the vicinity of Blair Hut after the one to the Diamantina Horse Yards. I'll explain where we went first, then where it might be better to go.
We walked south along the fire trail, crossing the Diamantina River on a concrete bridge, past a signposted right turn to the Diamantina Horse Yards, and up to a small gap. We then continued along the fire trail. After a few hundred metres, Blair Hut came into view below us on the other side of the Kiewa River. The fire trail then gradually descended. We were looking for a side trail marked on our map as a left turn just before the bridge over the Kiewa River. However, we did not see this trail, so we crossed the bridge and continued about 100 metres to where a second left turn was marked on our map. This trail proved to be present although indistinct. We followed it uphill, past some ruins, and past an indistinct left turn, to a T intersection, where we turned right up the hill. After a few hundred metres we passed a faint fire trail branching off to the left. All this conforms exactly to the maps except for the missing left turn just before the Kiewa River bridge.
At the T intersection we observed that the left turn down to Blair Hut and the right turn that we took were very distinct, much more so than the other trails in the area. It thus seems likely that the best way through these trails would be via Blair Hut. At the small gap we observed an intersection where a path bears left and drops down towards the river. One of the maps shows this path crossing the river and going to Blair Hut; then from there the maps show a fire trail up the hill to the T intersection. This might be a better way, unless it's awkward getting across the river. The path looks as though most of its users are on horseback.
Once through the tangle of trails everything becomes very simple. The path is clear, well graded, and pleasant, winding uphill through the forest. There is good water at a creek crossing about halfway up. The path splits a few metres before Weston Hut, but both branches go to the hut. There are no signposts at Weston Hut; if proceeding downhill, go to the hut and turn right down either path. We were told that there was water at Weston Hut but we did not search for it. The path from Weston Hut up onto the High Plains is clear, and signposted where it meets the more frequented paths.