Wrenn-Hornby Dublo Chassis

[SquiddlyDiddly]

Can somebody help?

 

I need to know the size of the screw thread of the brass top bearing on the upright Wrenn / Dublo metal chassis that holds the armature.. I have one with a cross thread and am hoping to ream it out with the correct sized tap but I don't know the size. I know it is not metric so it will be whitworth or BA I suppose.

 

Any help would be appreciated.

 

Andy

[sagaguy]

It`s 9/32 x 40 tpi,a model engineering thread if it`s the large bearing assy.If it`s the earlier small bearing,it`s 5/32 x 40 tpi.

 

                    Ray.

Edited September 16, 2017 by sagaguy

[SquiddlyDiddly]

It`s 9/32 x 40 tpi,a model engineering thread if it`s the large bearing assy.If it`s the earlier small bearing,it`s 5/32 x 40 tpi.

 

                    Ray.

Thanks for the info Ray.  Andy