I've had lots of issues with dry ht-100s failing. Mostly when trolling wire, and I suspect it has to do with water intruding into the drag area. The fellow on THT advocates using Shimano star drag grease on those (a teflon based syn grease). Apparently he services hundreds of reels as a sideline and has found this to be very effective. Personally, I've greased up the ht-100s on my 113s and will probably do the same on a 710 that I converted to manual pickup. I'll let you know the results next year when I take them down again.
Meanwhile, I'll have to find some fish big enough to test the drags.
