With Broader and Speedmaster in the news, I know Speedmaster also sells cheap Top Loader parts.
A Speedmaster input is $89 on ebay and a DKT input is $179 from them.
That's a big jump, but I think the quality is there to justify the price difference.
I built Red Strip using DKT shaft's and parts.
Costs more but for years of hard use, well worth the investment.
DKT marks their shafts for id.
The light switch is holding on.
I'm going to adjust the rods a bit.