A guard insert having a body and a guide. The body can include a top surface, an opposed bottom surface, and a plurality of side edges extending between the top and bottom surfaces and including a front side edge. The body can define a slot and a plurality of fastener-receiving openings. The slot can extend inwardly from the front side edge. The plurality of fastener-receiving openings can extend through the top and bottom surfaces, with each opening of the plurality of fastener-receiving openings being configured to receive a fastener. The guide can be securely received within the slot of the body. The guide can have an outer peripheral wall and an inner peripheral wall. The outer peripheral wall can have a shape complementary to the slot, and at least a portion of the inner peripheral wall can define a channel configured for receiving yarn.