I believed and have read recently that all front hubs were the same..however when i came to offer up my new girling brake drums today they do not fit up to the hub back plate as my hubs have a 1mm high 4mm deep lip.. as i do not have the original drums am i missing something basic?

Location: pennines

This sounds like a Big Seven outer hub.

As R suggests.

Big 7 have the small lip.

As do the late 1938 austin 7 for full girling brakes.

The drums can be simply filed with a half rond file to fit your hubs.

The three countersink holes come to the same centres to fix the drum.

Tony.

Location: Huncote on the pig

Thankyou Gentlemen.. The file has already been out and the nearside is sitting nice and snug..

Location: pennines

I found a brake drum I had was missing the 3 countersink screw holes,I thought they all had them ?

Location: Channel Islands

Up to 1928 the brake drums were not attached to the hubs so didn't have the countersunk holes. The outer hub flange holes were countersunk and the small 1/4 BSF screws (BL19) were shorter.