u/vrabie-mica

I was refurb'ing some old panels for a friend the other day, and came across this strange terminal block inside an ancient BP (yes British Petroleum!) BP250/1 50-watt monocrystalline one, which I think dates back to the 90s, or early 2000s.

It looks a special tool might be required to loosen and replace the wires, which were cut right outside that cable gland, or I'd just leave them. Through those small holes I can see some sort of bus bars or metal rods inside, but trying to push and pull against them with a multimeter probe and other thin implements didn't get me far. I did confirm blue is - and red/orange is +, and that the bypass diodes are still good.

Has anyone seen these types of terminals before? TIA.