Ive got an Abene but a slightly earlier model from the mid 60's Confirmed as very sturdy with good table size, plenty of fine feeds and rapids in all directions.
The knee is oil filed and I always suffered leaks from the lifting screw until recently when I renewed seals and gaskets. Mine had also fuffered from coolent getting into this knee gearbox in its working life but I managed to get limited spares from Abene.
Worth checking it doesnt jump out of gear and sounds ok in all rapids.
Peter