So I got an old Murray for $5, but the frame doesn't fit as well as my old Huffy (and I noticed some frame damage that makes me nervous after I brought it home). I bought it because all the parts appear pretty much identical and I was going to use it as a donor cycle for my winter riding. After 2 years of salt and neglect, the components are screaming.
The replacement has a triple on the front instead of a double, but everything appears to be the same component wise.
I found Park Tool's page on how to do this, but I'm only going to do this once (or maybe twice if I find a new donor), so I don't want to buy a bunch of tools for this.
Is there a good way to do this with some improvised tools?