if push work gives you fits, you're not alone. the air toys allow one to work faster and more efficiently. they also shorten "the curve". be aware-- the skill comes from diligent practice, not any sort of tool. as has been said many times," the skill comes from the guiding hand, not the tool"...
it can be a pain for some, but when nearing the edge of the fov, just use yer left hand and reorient a bit. this works if one has no turntable or centering vise.
cool for sure. when i suspected a point, i just shoved it under the scope. perfect power and lighting. i do use a similar pocket scope when mass resharpening. the little on board led makes quick of tip inspections. i don't recal where i got mine. it was about 18 bucks & free shipping.
i made one shown by shaun hughes. they do work. and are very cheap to make compared to lindsay or grs. it's the old addage, "you get what you pay for". convenience/reliability, or inconvenience and maybe some problems.
i use a lot of wet/dry. when it loses efficiency, i still use it in the next step of sanding. i do enamelling on pendants and such. why would you sand the glass surface ? at least what i do comes out very smooth and needs no levelling.
super glue works for many tricky situations. two or three drops should work. when done, forget the torch. instead, soak the plate and block in acetone. it takes time, but works. a far better idea--- use hotmelt glue. available in most anny hardware outlet. when time to remove plate, isopropyl...