Extract Composite Video Baseband Signal from Laserdisc RF...

Can somebody explain to me how to make a circuit that would do this?  I have 3 Laserdisc players and am willing to cannibalize 1 or 2 of them in an attempt to do this.  According to this information, it should be possible to tap the RF signal directly from the pickup and chop off everything below 4mhz with a high-pass filter and then you are left with just the video portion of the signal.  I think you could then feed this signal into a capture card and totally bypass the ancient circuitry of the player itself.  

I possess the skills to solder things together but I lack the knowledge of how to design the circuit.  Is there somebody who could assist me with designing this?  I would be the one doing all of the legwork, of course.  I just need somebody with the brains to tell me how to do it in layman/caveman terms.

Yeah his project is pretty awesome.  However, he is still using the laserdisc player's analog filters to get the composite signal. I'd like to bypass everything in the laserdisc player if possible.

If I can get to a point where I can extract a clean composite signal before the TBC, the first thing I'm going to do is feed it to his program and see what pops out.

I followed the thread above, but there is also this one.

And I'm interested in this solution too... think what kind of signal could be obtained from top laserdisc players...

Some capture cards digitize things and do internal processing at 12bit instead of 8.  However, if you allow the signal to pass through the tbc and comb filter of the player it gets sampled at 8bit before ever leaving the player. It seems like allowing the capture card to sample at 12bit would allow for the comb filter etc. in the card to make much better decisions in respect to y/c separation and denoising.

I've been pouring through schematics of the hld-x0 in the service manual.  I was thinking of just ordering the parts needed to recreate the ntsc demodulation of this player since it is the best of the best.  This would also allow me to simply look at the schematic as a reference whilst wiring everything together.  Compiling a list of all the parts will be easy but finding them for purchase online might not be.  There seems to be 2 IC's which are probably going to be hard to find.  The rest is just capacitors, resistors, and transistors which are all available from ebay.