[kaznelson]

Originally Posted by hfpop

I have not enough peace of mind to read carefully the install.ffs script to verify if I can skip the uninstall step.

Removal before installation of other font-sizes is not required.

Spoiler:

if [ -f ${KF7_HACK} ] && [ ! -f ${KF7_BAK} ]; then
    logmsg "I" "copy" "	Backup original file (${KF7_ORIG})"
    cp -f ${KF7_ORIG} ${KF7_BAK}
    logmsg "I" "move" "	Create new resource file (${KF7_ORIG})"
    mv -f ${KF7_HACK} ${LIB_DIR}
elif [ -f ${KF7_HACK} ] && [ -f ${KF7_BAK} ]; then
    logmsg "I" "move" "	Backup exist, skipped. Replace old file (${KF7_ORIG})"
    mv -f ${KF7_HACK} ${LIB_DIR}
else
    logmsg "I" "check" "Skip: ${KF7_HACK} not found."
fi

Originally Posted by hfpop

I have to admit that I would like a 1 pixel step. I know, if I want too much, I lose the gift, but anyway...

Hm-m-m, 1 pixel step? There can be identical sizes of the next steps...

For example - real height in pixels for line 2_26-40 (letters - S/e, font - Helvetica LT):

26/19; 29/21; 31/22; 32/23; 34/25; 37/27; 40/29; 42/31

For calculation it's possible to choose a one pixel step - but really it depends on chosen font and algorithm of font processing by Kindle.

Also it's difficult to make "very well" for all. In a range from 16 to 40 pixels - 18 (!) possible size-sets.