Hi oz, presume your post was referring to mine...well ok. I think by now you'd already know my thoughts on where the potential problems lie in your post.
In any case, I am more interested in how any of you got to be doing this. I mean you don't just wake up one day and think 'I know enough to pop this lid and start changing components', how did you start? How did you get the knowledge enough to even know it is possible that changes can be made if you follow me.
As I said, when you think about it it is reasonable that you should be able to do this stuff, it is not too far removed from the guy who changes carbs on the car, so logically this stuff should be doable. So did you grow up building cat's whiskers radios?? You are an electronics tech?
Is there anyone who does this and does NOT have that sort of background? If so, how did you start. Reading how to's on the net or forums??
And again, how do you know what to change. Is there a generic formula, I dunno, 'in most cases the clock is the block, so it usually makes sense to always change that' or is it more defined, 'this model has a good clock, so in this case we need to change this other component'.
As you can see, all of these questions come from a place of complete ignorance, and when we don't know how to do something the thing looks like magic!