WTB: Manfrotto 503 tripod head

I am considering selling my Bogen 515MVB Pro Video Tripod with 510-8 Pro Video fluid head (with canvas carrying case with strap)
 
i have been looking into the 501 & 503 heads A LOT. The only difference I can find is that the 503 has a spring to assist in the tilt. however, neither are even true fluid heads.

can anyone add any insight into this?

thanks,
tony
 
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