One of my Valve Inspection Caps (ET24) has a crack where a DPO took his slip-joint/arc-joint/water-pump pliers to it rather than using the proper tool. Seeking suggestions on how to fix it so it does not leak oil through it. It was previously sealed with white silicone seal (e.g. caulk) which washed when I was cleaning it with gasoline. I do not have a welder. I was thinking of packing JB weld through the crack which the little bit exposed would match the dull gray cap (Stainless?). Other suggestions welcome. Thank you.