I use(d) the top tube method. Works fine with the cabling.
My issue is that I loose\break parts every 6 months. Both of mine lost the same parts this last week and I am afraid that is just about the last straw. Good pump but the durability is crap.
I'm going to do the usual and ask for parts from Topeak but I think it is time to move on.
My current method is an airstick and a co2 inflator.
I think the only pump I have ever been happy with was an old zefal frame pump. Perhaps it is time to look for a new one.