Checking back in here after not posting for 3 weeks as this old guy has returned to a more tenable pace without the demands of a full-time work schedule now that I've achieved substantial completion on my winter project....
I've always been an advocate of using appropriate, quality tools for any given job, but can make little sense of spending hundreds of dollars on a pen just because it comes with appropriate sized bits for a particular knife. I did buy a Shiro hedgehog tool from Vladimir_K for 50 bucks which fits well and is kinda cool, but lacks much leverage if needed, and I find its fixed thickness gauges more useful than its bit drivers. I also bought a very nicely milled aluminum Shiro tool from Jekyll to Hyde--also 50 bucks--which fits excellently too, but its hexagonal handle affords not the greatest grip nor leverage either. REK's bits make a lot of sense and I like supporting Josh, much as I do Bill (or Sergey, for that matter), but they're not inexpensive, though I'm sure they're a great fit and I understand the cost/time synthesis of small batch, machined items.
Given the nature of my thick, old, arthritic carpenter's mitts, the best tool for me loosening or tightening PacMan screws without marring is an appropriately sized common bit shrouded with electrical tape in one of my stubby Wiha drivers. If I don't need a lot of leverage, I can use either the hedgehog or the JtoH tool, but if I need to break thread locker (though I avoid it if at all possible) or really honk a screw down, it's the taped common driver for me.
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