Just a quick one !
any one have those Dimmer light switches in there house ?
well i had a look at one the other day and the little toggle switch come off - looking on the other side of it is a starburst pattern - differnt to the D type holes
well if you look at you radio dial knobs, some of them are the same - it need to be one that is flat to the wall plate
bingo ! you now have a bit more boombox in your house 
got to look in my spares box for one and then see how long it take the wife to find it  
go see if it will work on yours
cheers B

oh i like that B...I like it a lot  

Used to have one, sadly its all switches now which is a pain as my eyes are better off in lower light.

I have used knobs from old microwave ovens, they had the d hole. Knobs from old electrical ovens should do the trick also.