Alan
One issue you always get with totan is that the right inlane outlane plastic always breaks as it doesn't go all the way to the top of the divider. Once this happens the ball can easily jump between the lanes usually inlane to outlane.
Years ago I had one of these made up for my totan. It serves to stop the plastic breaking or if the plastic is already broken it serves to reinstate the divider but better.
I had a load made up as it was little difference in price whether I had one made or 10 or 50. I think I opted for 50, maybe 30. It was when I lived in Malaysia 20 years ago and in the relatively early days of cad and laser cutting. They were done by a company that was supplying a friend's low volume bespoke medical equipment business with one off parts. Once on the machine they look factory.
I will pop one in the post to you.
)
Today I picked up this 1934 Daval Blue Streak for the princely sum of 85 quid 
Never had a pre-war game before and this is more a jigsaw puzzle than pinball machine but should make for an interesting little project. It was the flyer that sold me on it, looks like it could be fun!
(you still need to invoice me!)