I think HP stands for Horizontal Position .. or Hole Placement. There are 5 HP in 1 inch, so 1 HP = approximately 5mm.
2018-08-19 00:03:46 +0000 UTC
uhm. i know the feeling. Never enough. And you change enough... but you have to complete it now...
incidentally, what does HP stand for?
and the music was interesting to say the least