I did not know this but you can buy a pack of replacement nibs or tips for the surface pen.
I note that there is a newer version with 4 nibs (2H H HB B)
The 3 pack that I bought was about AUD$30 at The Good Guys.
I recently upgraded from Surface Pro 4 to the latest Surface Pro 7 but was able to keep the keyboard/cover, mouse, dock and pen.
However my Surface Pen had been “broken” and I was looking online to decide whether or not to get the same pen for about $140 or shell out for the latest “slim” version for $235.
Although the “slim” version has a rechargeable battery, I don’t draw so the extra features on this more expensive one would be wasted on me.
However while searching for the best price, I came across the much cheaper replacement tips.
I knew it was the tip that was not functioning correctly not only because it still worked (sort of), but also from how it got “broken”. A visitor (who will remain nameless) asked if I had a pen she could use. I referred her to my desk that had 3 ball point pens on it in plain sight. Despite this, she decided to detach what was clearly a stylus magnetically clipped to the side of my Surface Pro 4 and attempted to use it to write on paper. When it would not write, she then proceeded to press down on it heavily and by the time I noticed she had bent the tip.
It did continue to work but was never the same. For example, it was hard to get straight edges when used with Photo Shop Elements. The very same person asked me to use Photo Shop Elements to remove a wine glass from a photo, but when I could not get a straight edge on the table she complained. When I tried to point out that the stylus she had damaged was the cause of the problem, her contemptuous reply was “a bad workman always blames his tools”. You can’t win!
The old tip can be pulled out easily with needle nose pliers and the new one is pushed in by hand. Don’t use pliers to insert the new one, but press reasonably firmly to make sure it is seated correctly. There are plenty of YouTube videos showing how.