Block-bracing apparatus including at least three plugs threadedly engageable through a block, and retaining rings engaging the block threaded oppositely to the threaded plugs and retainably engaging the plugs. A key tool is provided to tighten the plugs and retaining rings. A longitudinally oriented T-rail projects radially from the block. A slide body engages the T-rail and includes a locking mechanism, a lamp assembly, a logically switched power control, a power cable, and a control cable with interchangeable switches.