Dropped spindles have been around since long before Speedway. Anybody know or should I say remember how it was done?
They were manufactured new for the Model T for the aftermarket just as those today are done. There were also individuals who cut and welded spindles just as there are today.
There were also elaborate kits of fairly simple bracketry that simply moved stock uprights upward, typically by adding links the length of the drop between upright and lower bushings (this is pre-balljoint) and a spacer to move up top A-arm. This kits typically contained no parts much more complicated than short pieces of strap steel with a couple of holes... early GM's used A-arms that looked like bolt together assemblages of erector set parts... these could be lowered another way by bolting in spacers between the part that held the spring and the girders around the edge. Ford made its own drop spindles for T's--I think there were a couple of different heights here, and some lower ones in the UK. There were also bolt-on drop kits that were essentially suicide mounts for the front spring.