Three things I learned on this job...shagbark hickory is HARD to work with...it's hard to get good spur placement...several times as I ascended the first time my spur skidded off the hard plates of the bark.
Second, the wood itself is very dense...the spurs didn't penetrate very much.
Third, the bark plates can really grab/hold/get in the way of ropework. Several times I had to descend to release a pinched rope from the bark.