Markland backrest question

[Snaggletooth]

Ok.....I'm about finished piecing together a Markland backrest I've been working on. The pivots were my problem and I got it worked out to what I show in the pics.

 

My question is did the Markland use a knob and stud as a tightening device you could do by hand or was it just a bolt to hold the pivot together like I have done. Can anybody provide a pic or two of the pivot?

 

I used a threaded spacer bushing with nylon washers on either side of the pivot disk on the support arms and metal washer that fits over the smaller side of the bushing to compress the nylons a bit. No rattle, smooth tilt action, but is it the way it should be?

 

Trying to get it right.

 

Mike