I had a nose about on YouTube and found a couple of videos. The first gives an overview of the machine and shows some accessories as well as (at 18:30) a wiring diagram, whilst the second shows the fitting of a Unimat-style fretsaw attachment. (I think some of the parts shown in the first video are for this attachment which seems to use a spring return for the blade).
I don't speak Russian so have no idea how good or bad the auto translation of the auto generated Russian subtitles are, or for that matter if the videos contain advertising banned under the new terms and conditions – hopefully the moderators will forgive me.
Brian G