Adapt your bolt to a standard male thread with these stainless bolt handle adapters. They are lathe spun and threaded to a Class 3 fit, and allow you to use most aftermarket bolt knobs.
These have become necessary in the last few years as action makers go to smaller stock in their bolt-making process and use female attachment points on a shorter handle.
NOTE: If ordering for a BigHorn TL3 please confirm that your bolt handle has a female thread in the handle. Some older TL3s have a threaded male end on the handle, which will render these adapters incompatible.