Take a look at these documents. The one called "Colchester Clausing manual" is a US manual that actually describes how to do stuff, rather than simply show an exploded view and a parts list. It's actually for a Bantam but the construction looks very similar, so perhaps it may help.
You probably just need a bigger hammer!
Murray
I see the "Notesto be readwithClausing" actually describes and shows it in the flesh. Looks pretty helpful.
Edited By Muzzer on 20/04/2018 23:57:24