Re the staked/bruised screws I have both carefully ground them with a rotary burr and have also equally carefully drilled them. A light centre pop will be enough to centralize the drill bit. But be careful to support the otherside of the butterfly shaft when you pop it so it doesn't get bent, also support it if/when you rebruise the end of the screw. Far more reliable than the locktite route.I gather the loose part you are talking about is the round plug on the top of the diaphragm housing, it should be tight.A part that often gets over looked for replacement is the needle and the needle jet. this is the part in the centre of your picture, the 2nd piece below the main jet housing body. It will have a no. on it. Neil should have them in stock, just don't replace the one without the other. this will have an immediate effect on reducing fuel consumption, and yes replace the spring. email me on if I can be of further assistance.
