There are several sources that discuss the reasons why some polearm handles have studs. Here are a few examples:
- "The Polearm Primer" by Paulus Hector Mair: This historical treatise on polearms, written in the 16th century, mentions the use of studs on the handles of some weapons. Mair explains that the studs serve to improve grip and control, and also notes that they can be used to counterbalance the weight of the weapon.
- "The Medieval Poleaxe" by Michael Tinker Pearce: This modern book on historical arms and armor also discusses the use of studs on polearms. Pearce explains that the studs can improve grip and control, as well as provide decorative elements to the weapon.
- "Polearms of Paulus Hector Mair" by Jeffrey L. Forgeng: This scholarly work provides an in-depth analysis of Mair's treatise on polearms, and includes a translation of the relevant section on studs. Forgeng notes that Mair emphasizes the importance of grip and control in polearm combat, and suggests that the studs are a way to achieve those goals.
Overall, the use of studs on polearm handles appears to be a common practice throughout history, with functional and decorative purposes.