For you non-sailors, the bobstay is part of the forward rigging of the main mast. it is held in tension with the forestay, joined at a plate on the forward bow pulpit. It helps keep the main mast from falling backward.
Construction is essentially a solid stainless steel rod, size -30 (about 0.5 inch diameter) with a large turnbuckle on one end and toggles on both ends .
|Toggle and turnbuckle "upper" end|
|Toggle on the "lower" end|
|Test fit, lower end|
|Test fit, upper end|