I think you'll find your probably in the city with the most threaders ever. You can find a dime a dosen on st peters road, belgrave road, melton road, green lane road, highfields (nedham street) and evington (east park road). I'm not kidding, you just need to drive/walk around these places and pop in, you don't even need appointments. Sorry I don't have names for you, but you can't really miss them amongst the shops.