going to a straight vane allowed more room in the tub, hence they could push the issue of calling it a 16lb machine....
the ramped V12 was sort of a cone shape, which took up more space....even in the 60's they offered another version of the ramped activator, with vanes sticking out all the way up the shaft versus the V12's version tapering off as it got towards the top.....
since the 18lbs machine was created, it had about a 10 year run of straight vane, there were two styles....
and somewhere around 78-79 they went with the ramped for both size machines...
the filter flo and agitator mounted filter was a GE exclusive......
Hotpoint and JCPenney machines were rim-flo machines.....in place of the mini-basket, many used a 2-n-1 handwash agitator....straight vane at first, and that too went to a ramped version...if I am correct, the 2-n-1 was available on the 18lb machines only...
during the last run, only mini-basket machines got a filter pan....as in trying to cut expenses, one transmission was used for both size machines...