Hello Steve and thank you
No preload on this one as it has 4 bearings and they were a tight fit on the shaft , I cannot feel any lateral give so every thing is very tight but I have since
made another ER32 and ER25 headstock but with a smaller 20mm shaft and with a larger bearing in both. Fitment is not quite as tight so this allowed me
to place an rubber O-ring in between the rear pulley and bearing and preload set that way . Everything on these very tight with absolutely no measurable play .
Picture of The ER16 , ER25 , ER32 Taig heastocks + the first ER32 unit stil on lathe .