I have a progress 1S which had a seized driven pulley bearing. I got new bearings but the shaft the bearings sit on is badly warn (probably as a result of the seized bearing spinning on the shaft). So I am after a new/non-warn driven pulley.
I stripped it down as follows:
Remove the knurled nuts from the depth gauge.
Lower the table or swing to the side (enough that the spindle can be removed).
Lower the spindle by the handle and when loose extract it and put it to one side (this can be stripped down but I haven’t done it yet)
Loosen or remove the grub screw above the upper grease nipple on the front of the drill.
Using a suitable bar, drift the driven pulley assembly (the bearings come out with the pulley) out of the drill head.
The bearings can be removed from the driven pulley shaft buy firstly removing the circlip at the end and then using suitable bearing pullers remove the bearings.
I hope this helps and to roman gawel, if you have no luck with repairing your drill I might be interested in buying spares from you. Please let me know.
Colin
July 2010