Q-jet accelerator skirt issues please help

[DirtyK30]

I was wondering if some one could shine some light on a problem i've been having.

I have an early 70's q-jet with mechanical choke and a fuel line that enters from the front left when looking at the motor from the front of the truck. About a year and a half ago the skirt on the accelerator pump deteriorated and fell off . it was an older style black rubber skirt. I rebuilt the carb and installed the new accelerator pump that came in the kit with a blue rubber skirt. since then the skirt has not deteriorated but has fallen off the accelerator pump shaft three time each resulting in a hard start. i replaced the accelerator pump with new skirt twice and did another full rebuild the most recent time and checked the accelerator well for burrs or debris and found none i also made sure all the fuel passages were clear as not to form a suction and pull the skirt off. About a day ago the hard start symptoms started again and sure enough the skirt has fallen off again. I am stumped as to why the skirt keeps falling off. Has anyone had a similar problem or know of a remedy? any help would be greatly appreciated. Thanks in advance.