choke dropping

[neat street]

Hi All, yet another issue with the carbs, No 1 choke seems to drop out of its slider bar (small bar inside carb from choke leaver to choke), therefore choke on all the time. I have taken it all apart and cant find any real issues but have replace the choke and link bar from another set of carbs, but it has done the same again? any ideas to solve this would be appreciated.
Thanks
John

[neat street]

Hi all, for information if you have this issue, is look at the small plastic washer which fits to the outside of the choke leaver (held on with nut and washer from the outside and has a stepped section which goes into the carb housing and onto the small slider bar). this part had worn down a little too much and allowed too much movement of the slider bar. replaced with spare, now OK. (hope you can understand this as the parts drawing does not show this detail)
John