Handrail Stabilizing Plug
The jig that supports Fig. 4 type handrails (see image) collapses slightly when used, causing the through bolt and handrail to loosen.
The Stabilizing Plug, when tapped into the jig, prevents the jig from collapsing and creates a solid area to tighten the nut and bolt against.
We at Pool Vac Parts carries a complete line of specialty tools for your pool manufactured by Pool Tool.