heavy tenors

[jimhedgcock]

There are numerous rings of bells where the tenor is considerably 
heavier than one would expect when compared with the next lightest in 
the ring. Generally these tenors are Taylor bells from a certain 
period.
Examples are :-
Raunds Northants - 7th. 12 0 16, tenor 22 0 8 Taylor 1898
Redcliffe 11th. 25 1 5, tenor 50 2 21 Taylor 1903
Exeter 11th. 40 3 19, tenor 72 2 2 Taylor 1902
Louth 7th. 15 1 12, tenor 31 0 7 Taylor 1909
There are of course other examples. Can anyone explain why these 
recast tenors were made with disproportionate weights?