Since I see you're from Poland,and because of that obviously on the Metric System,I'll help you out here.
.220 = roughly 5.5mm,close enough the difference won't matter.
.200 = 5mm.
.180 = 4.5mm.
If you want to really pin it down exact,to go from Imperial to Metric,take the Imperial number and divide it by .03937. That gives you the Metric equivalent in millimeters,in this case 5.58.
To reverse it,multiply the Metric number by .03937,in this case it comes out to .2196.
As far as compressing the tip,it's easiest to do with a good,solid vise and using FORCE that can be measured in pounds per square inch or PSI,rather than weight. In the Metric System,this is measured in kPa.
The way I do mine is putting the tip in the vise,with the bottom of the tip against the back or unmoveable jaw,and keep going until I can't get it any tighter without using a piece of pipe to increase leverage.
I loosen the vise,turn the tip around,and do it again with the bottom of the tip against the moveable jaw.
I've never tried leaving a tip in a vise for extended periods of time,but it might work in some cases.
Hope this helps,and wasn't too complicated,Tommy D.