Vintage Windmill and Wind Generator Forum

Found out that our Dempster is a Model 16 Thank you , also we need a replacement main shaft ??, anything avail ?

This unit is located in Simi Valley Ca at our local Historical Museum , we think it is pre 1925, Main Shaft bushings are brass.
Can anyone tell me if the brake mechanism used a friction material or is metal to metal correct?
Secondly the main shaft is badly worn, are replacements available or ...