Raliegh Record Road bike crank arm?

I am a newbie and just bought a used road bike. Bike had a left crank arm that was worn thus it had a lot of play. The square taper bottom bracket uses a nut on a threaded spindle stud(fig 7) to hold crank arm. I went to local bike shop and showed them the old crank arm and they gave me a new crank arm. I tried installing new crank arm but it seems to be too tight.



My question are:



Is the crank arm supposed to be press fit into the bottom bracket? Or do I have the wrong size crank arm?



Also from what I read online bottom brackets that use a threaded spindle are supposed to be of lesser quality that those that use are hollow and use a bolt instead of a nut(fig 5) If I decide to change bottom bracket how do I know which size or variety to purchase?



Here is a link to the fig's I'm referring to:

http://www.parktool.com/repair/readhowto.asp?id=103



Thanks in advanceRaliegh Record Road bike crank arm?
The crank arm is a press fit. That is why you need a crank puller to remove it.



Cranks are pressed tight onto the tapered square spindle. The square spindle is made with a slight upward sloping taper. The crank square fitting also has a slight taper (Figure 10). The crank bolt or nut acts as the pressing tool and forces the arm up the slope of the spindle. The bolt or nut must be tight enough to keep from loosening, but not so tight that the spindle splits and damages crank. If possible, use a torque wrench.



I wouldn't bother changing the bottom bracket until you have a problem with it.

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