Hornby Dublo / Wrenn motor top spring, to hold brush arms, spare, 18006. Measures 3cm long. Unused original item, ex Wrenn factory stock. Suits the 2 or 3 rail class 20 Bo Bo diesel, possibly other locos as well. Please see my other auctions for similar items!  Postage cheerfully combined - just add the items to your basket and pay in one go, discounts automatically applied at checkout!