Grapper

1997, Professor Department of History Sydney Anglo, Sydney Anglo, Spectacle, Pageantry, and Early Tudor Policy, Oxford University Press on Demand Likewise , if the jouster's spear were tied with 'thonge' or 'grappers', he should be ejected ignominiously.

Source: wiktionary

[Grappers] were first introduced in the early fourteenth century and became standard after the introduction of the lance-rest in the late 1300s. A description of the grapper as it was configured in 1446 is provided in an anonymous French manuscript as follows: Item, the said grappers are intentionally full of sharp little spikes like little diamonds, similar in size to little ...

Source: wiktionary

Nor was the danger entirely at the point of the lance. An inexpert lancer, because the grapper transmitted much of the shock to the feltlined lance arrest secured to the right side of his breastplate, might be flung from saddle […]

Source: wiktionary

It's got a lance rest to fit the grapper to. It makes the whole breastplate take the shock, and not just his arm. You brace the end against your side; that'll give you firmer balance, see?” Noel nodded, and Tobin sprang away.

Source: wiktionary