Sounds like it's a poorly made nut, very slightly larger at one end rather than deliberately tapered.
Use a 1 5/16" AF deep socket or large adjustable.
You could use the 33mm socket as on that diameter .5mm bigger shouldn't be an issue.
I wonder if you could get to 250Nm with the pressed steel spanner ? Maybe a long tube on the end and turn the spanner till it bends ?
Never heard of a torque wrench being used but 250Nm tells me it needs to be tight.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
'58 Series II (sold)
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C
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