INSTALL NOTE: This aluminum 8-550 main gear is not threaded and only works with a slot-through hex shaft handle. This was the original design of the 550SS which was quickly changed and therefore those handle parts especially are uncommon. What to expect from Fishgrain? prompt service items always as described smooth and accurate transactions excellent packaging effective and fast communication I like helping and making people happy with fishing tackle. -JG Helpful Tips Use ' add to cart ' button when purchasing multiple items This will combine your items into a single checkout with (1) shipping charge Use ' see other items ' link to search Fishgrain inventory Contact me anytime with questions or concerns of any kind I am happy to help you with anything fishing related Thank you .... all orders are sincerely appreciated