This tip come up as friend was helping me he did not know that you should grease the Threaded area and or oil pivot points make tool work better last longerbe safer. Spring removing tools, pullers tools, press tools, this pretty much most fall under this but if it has threaded area grease it before use or re new the grease if very dirty. Reg bearing grease will work ok, but high pressure grease like spring puller tools.
As a safety point If the threaded area chewed up or starts to show areal color change where the most force threaded area is being used might be starting to heat harden to mean dry uses or mean hard jobs after mean years. Maybe it's time to replace.
If the threads look new and you grease them ever time it's used should be ok check them threads your safety is on the line.
If threads are greased and will color a little because of hard uses, but threads are not cracking, chips, or rounded off, mashed, the nut or shaft should be smooth when rotating back forth should be good. If not replace parts to specifications parts. Or the hole tool. (IE. 8 grade nut with a 8 grade nut) Using a high pressure grease on the threads of these tools make it function proper and protects them against failure.
Threaded pulling and installation tools can prove to be real time savers & often the only way to get the job done right.