As said, lube inside of neck. But the resistance on the upstroke is normal. Down stroke squeezes case and neck down to size. Actually usually squeeze neck down too small. So on the upstroke, the 'knob' on the decap pin (on most dies) opens the neck just enough to accept a jacketed bullet.
Not on all dies. Bushing dies= redding, forster, hornady,rcbs, and harrels precision and others . A bushing die allows the user to control the amount of tension put on the neck. They DO NOT squeeze the neck to tight. Here is an example. A loaded 308 Lapua brass with bullet has a .337 loaded neck. So if you have a bushing die with a .336 bushing it CAN NOT be smaller than .336. So you end up with 1 ths neck tension. ALso the "knob" you are refering to is called a expander button, so a perminatly attached. Some are interchange able, so you can swap them. They even make a tapered expander ball. A tapered expander ball can be from 1 caliber to another, I use a 6.5 to 7mm tapered expander ball to make 6.5x284 lapua brass into 284 brass. The decaping pin DOES not open up anything= the expander ball does not have to be used= except for crimped or out of shape brass mouths. But most common hunting type reloading dies Do have the expander ball that you can change. Not trying to be an ass or confuse anyone, just trying to give you the whole truth, correct names for parts, and explan the process better and give you options!