[Stano]

Was the metal piece a square horseshoe shape? If so this goes into the slotted grooves in the base of the carb. If you are talking about removing the fuel inlet barb and looking in the round hole there should be a metal screen that fits in the seat for the float valve it just sits in there holding itself in. I would just go ahead and pull the carb off that way you can set it on the workbench and not drop anything in the intake. Before you pull the top off the carb pull out the metering rods so they dont get accidentally bent or something. Make sure not to lose the springs that are with them. You will be looking for anything that shouldnt be there (dirt,rust,goo,junk in general). Spray it out with carb cleaner and wipe it out with a clean towel. The seats for the metering rods are brass and round bout the size of a pencil you will see them in the bottom of the carb there will be 4. 2 where you pulled the metering rods out and two towards the back. Stick the tube from the carb cleaner in them and spray them out. Make sure you wear eye protection as some of the passages in the carb will be pointing toward you where the cleaner exits. Just spray out all the passages and wipe it all down good. These carbs are pretty simple and the rebuild kit runs like 30-40 dollars at the parts store it will be part #1477. Has gaskets and everything you will need. However not much for the instructions. The sheet mine came with said to set the float at 1 1/4 inches that is wrong it should be 15/16-1 inch. I got mine back on tonight and dialed in runs good just need to go for a test drive tomorrow, but I can tell already it fixed it ran it for a hour outside the shop and everything was back to normal again. If you need to know anything else just ask.