SOLEX CARBURETORS IDLE STOP SCREW & SPRING. new-never used. fits many types of solex carburetors. thread type is 5mm 0.75mm pitch. for any doubts please email before bidding. GUARANTEED PRODUCTS! Before you check out please make sure to check all the products available in our store.simply go to the web page below and within the search space provided on the upper left hand corner type the key word/s of the product you are looking for. [https://stores.ebay.com/alfa1750scarburetorspartsstore] (https://stores.ebay.com/alfa1750scarburetorspartsstore) payments accepted are; visa/mastercard paypal please email me for questions. thanx for looking!.