Several years ago the Shaffer lower double block for the main sheet parted from the traveler slide during a short New England cruise. I was able to limp by for quite a while until the system again failed in Newfoundland in 2010. I was able to jury rig a repair with the help of a local fisherman, but the job needed to be addressed properly. The slide is shown in the photo. This article shows the repair.
Next the shop cut and welded a piece of heavy stainless bar with part of a pin shackle. I wired the spring mount in a compressed position while the block itself was secured to the base by welding. The preliminary result is shown at left, and the final result at right.