15-04-2021, 04:11 PM
Charles,
Yes I did get your e-mail but have only just responded to your PM.
My lack of understanding related to Item 10 on your sketch and the slitting I mentioned was from several sources including the reply from Dave Wortley on here.
It looks to me as though the originals didn't have any slit so the tube didn't expand when the butterfly screw was tightened but more recently some have modified this presumably to hold the screen more rigidly.
John.
Yes I did get your e-mail but have only just responded to your PM.
My lack of understanding related to Item 10 on your sketch and the slitting I mentioned was from several sources including the reply from Dave Wortley on here.
It looks to me as though the originals didn't have any slit so the tube didn't expand when the butterfly screw was tightened but more recently some have modified this presumably to hold the screen more rigidly.
John.