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replace it, there is a screw in there to hold the diaphragm end to the housing, without it it will move freely and fail sooner than later. the screw/seal also prevent gas from leaking out once the diaphragm does fail.
the only mod I could think of to do to this one is to cut off that end, and weld on some plate... and I'm not doing that.
I think you would have to cut off the pd and tap it for a banjo bolt? Or weld on a fitting? If you can get it done, it sure would be the ridiculous price of almost 300$ for a new S5 primary fuel rail/pulsasion damper.
I would, but I just blew money on my MS2 and everything needed to run it... that will have to wait. In the mean time, I picked up an s4 rail today... just need a banjo bolt for it.