[TowerTalk] Pulling 1/4" coax?

[Gary K9GS]

I need to pull about 15' of RG58 through some 1 1/4" aluminum tubing. There are a few turns instead of a straight run.There is an existing coax already inside which I am replacing.  I have about a 4" pigtail of the old coax sticking out.Should I tape the new coax to the old and use the old coax to pull it through or should I use the old coax to pull a pull rope through?  Or something else?Ideas??73,Gary K9GS