thx for reply, bruce.
i have several filco kbs. and i love them. this is my first time i found it when i pulled out key caps, since some trick is needed. i am not a picky guy. i know what ping prob is, but i never treated it as a trouble. if i do not have any other filco kbs, i won't think it is a built prob. as you see from some member's pics, it is easy to figure it out by eyes. i just measure my kb, it is a little over 1mm shift to the right side within 20mm frame width. i could use the filco wire puller to pull it out, but never pull it out with that plastic IOI shape puller which i never have prob with to pull out a key cap before.
btw, i love the camo paint. it is fantastic.