Seatpost not holding attitude!

[Eric Marth]

Hi all -- I have recently acquired a NOS SR-Sakae Ringyo MTE-100 seatpost. It was just fine for several hundred miles and now it won't hold tension. Stock photo below. 

If I set the saddle to have the nose pitched up just a touch it pitches all the way up once I hit the first bump. This is driving me bananas. And not the good kind of bananas (i.e. chocolate-covered and frozen). 

Yes, the bolt is greased a'plenty. 

Tomorrow I can post some pictures of the assembly broken down for the curious.

Does anyone have any ideas as to a remedy? Peace and thanks.  

[mikel...@juno.com]

replace the quick release with a hex head bolt
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[lconley]

And/or replace the knurled nut with a washer and a nylock nut.

Laing