Byatts Camp is wrongly labeled on the old topo map anyhow. It is the basin about 1 km WSW of point 2159 around 1840 m alt.
The saddle(s) you want on Abbott Ridge are around 2020 m, just a bit over 1 km SSW of pt 2159. You will note the broken contour lines above 2000 m to the N of these saddles: BIG granite boulders which present some difficulties in passing over them.
The old wood signboard is at the top end of the Hannels Spur track, ON the track.

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The track goes NW down from here, and to the S from here. Find it. Headed down, you can see the problems with dead trees.

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They will keep falling over the track for the next 10+ years.
Cheers
Roger