Tom,
Heidegger! Yikes, a tough read!
Yes, I love digging down in to assumptions, axioms. It's become a reflexive habit for me when proposing any claim or argument that I first check myself for special pleading and consistency, seeing as far as I can in many directions whether the argument upsets any apple carts in my own philosophical structure. I may be wrong...but after many years I'm pretty confident in being consistent . :-) . Unfortunately I find attempts at arguments that are nuanced in the way philosophy often demands, often fall on deaf ears, and one faces a lot of straw-manning of one's position. When you even question someone's firm belief in a phenomenon, they seem to presume an opposite position of firmness to you. Hence any nuanced case for a skeptical - but not decided! - position is just ignored and doubt is characterized as dogmatism. Makes conversation about assumptions pretty tough. (But then, that's the nature of challenging assumptions in the first place).
Anyway,
Thanks very much for the info on altering the Thiel 02s. I'm not handy at all with such things and would have a professional furniture refinisher I've used before. If I go ahead, I'll keep the info and suggestions you've given as a helpful note.