Bleeding some rads today . Standard "key" worked on all bar one - key (5mm?) too small, 6mm socket too big.... Wtf?
Rad is twin panel format but with bleed values (helpfully) on the inward face of each panel NOT on the ends like usual...
Any ideas how to proceed? Tried long nose pliers & small mole grips but not enough angle to get enough grip.
Cheers
Jim K