Refurbished – what does it mean?

Armstrong damper are available as refurbished at almost every Healey dealer for some bugs by sending back the old ones. What does the refurbished mean, do they just clean it and refill with fresh oil? This is what I did and I cleaned it also outside and did a powder coating. But now the fresh and clean oil rinse out of the shaft. Question: how to get out the shaft?

Part number: front Shock absorber with arm (Armstrong) 3H1707 (or 3H1124)