First I was greedy. I took 2 springs for 2.5, 2 springs for P3, 2 more HP end caps, one more 510 thread, 4 more collectors end caps for 2.5 and P3, more beauty rings etc.
And then I tought about it - I had 2.5 for almost 5 years, never cleaned it (except 510 connector), never stretching spring...