Shaft assembly with internal UV-cured balance weight

1. A method for forming a shaft assembly, the method comprising:

providing a shaft structure, the shaft structure comprising a shaft and a universal joint member that is coupled to an end of the shaft;

inserting a weight member to the shaft structure to form an intermediate assembly, the weight member being formed at least partly from a liquid resin, the intermediate assembly having an initial rotational unbalance;

rotating the intermediate assembly about a longitudinal axis of the shaft structure to re-distribute a least a portion of the weight member circumferentially about the shaft structure to at least partly attenuate the initial rotational unbalance; and

curing the liquid resin while rotating the intermediate assembly to fix the re-distributed portion of the weight member to the shaft structure to thereby form a balance weight that at least partly attenuates the initial rotational unbalance.

2. The method of claim 1 , wherein curing the re-distributed portion of the weight member comprises transmitting ultra-violet light into the shaft structure.

3. The method of claim 2 , wherein a filament is received through the shaft structure and wherein the ultra-violet light is transmitted into the shaft structure through the filament.

4. The method of claim 3 , wherein the filament is disposed axially along the longitudinal axis of the shaft structure and through the universal joint member.

5. The method of claim 1 , wherein the weight member comprises particles formed of a material having a density that is greater than a density of the liquid resin.

6. The method of claim 5 , wherein the particles are formed of steel.