English is okay to me, maybe other member of the forum aren't use to
well
you went on a complete disassemble,
i didn't go so far,
i'll take a look on the horizontal mill attachement,
you are right, the gear seems to be the same but yes you don't have these screw on the right, i wonder why
i'll send picture of the head with the two speed selector
do you plan to scrape the slide ?
as it is all square and flat surface, it would be way easyer than dovetail slide which are a real pain to scrape
may be some day i'll go for a complete dissemblable to adjust all the slides, and change some bearing, one in the head make some noise,
these are simple ball bearing, not tapered but the runout is under 1/100 so for the moment, i don't wan't to touch it,
i don't really understand the cinematic of your head, look like a worm gear ?
@+