Bristol 400 Starter Motor

[Roxbyend]

I have had the starter motor original to my 400 rebuilt by a Rotherham firm. This is the long nose Lucas 35G type WG1 as illustrated in the spares manual. The actual motor is now working well but unfortunately while testing under load the castellated top of the worm drive fractured as seen in the attached photo.

To date they have been unable to source a replacement worm.

Does anyone have one of these worm drives or a redundant starter suitable for spares?

Thanks

John
Roxby, England