[TowerTalk] Long cable pull

[K4SAV]

After being disappointed in the direct burial method, I am planning on 
adding some conduit to access my low band receiving antennas.  I have 
one section of conduit that is 500 feet.  Can I do this with one pull, 
or will I be wishing a I had added an access box and broken the pull up 
into two parts? I have never pulled a 500 ft run before.  Since it is 
unlikely that I will ever want to add another cable into this conduit, I 
was planning on using 1.5 inch conduit.  The run will be straight except 
for a couple of very long curves and then the curve at the exit out of 
the ground at the ends.  I need to pull one run of RG6 and one run of 16 
ga landscape lightning cable for dc.  

Before someone suggests sending the dc down the RG6 to eliminate a 
cable, the dc resistance of 635 ft of RG6 is about 22 ohms.  (It's 625 
ft total to get to the operating position.)  Besides the RG6 already has 
dc controls signals on it as well as RF.

Second question: What is a good method of putting the pull string in a 
conduit this long?  I have put it there when building the conduit, but 
that is a pain.  I have used an air compressor to blow a string tied to 
a rag thru the conduit, but never on a conduit this long.  Is that 
likely to work?

Jerry, K4SAV