To get a better look - I hate getting down on my hands and knees at my age (don't ask!) - I removed the engine! Well, not straight away as I had to take off the exhaust, then the tool-box (wrong one, of course!), then the chain and chain guard, then the petrol tank, then disconnect the wiring and cables - until, hey presto! - out came the engine. Then I could take a good look at the stop plate.
When I took a good look at the plate I could see another bit of metal had been welded on as well as other 'additions'! All rather odd. I've included a picture of it for you to see. I guess a lot can happen to a Bantam in its 62 years of life. What else am I going to find, I wonder? However, it's all part of life's rich tapestry - or owning a Bantam! I've been there before, remember, with Little Willie. Noting is ever what it seems.....