Just picked this up on Wednesday. Now my back is killing me.

It was ½ mile from where I was working that day or I may have passed it up. I know it's the wrong reproducer (thorens No16) and the back bracket has some cracks, but still whole. I think I got if for a good price ($175) considering the cabinet is in very good shape,original grill, binders, and cloth (I believe.) The "A" binder has some wear (to many records) B has some scratching along the front, but the others are in good shape. The motor is a very gummy so it will need some work too. I've been reading up the last few months on these and (rereading the last few days) I haven't been able to find out if this low # had the brass or pot metal reproducer. I've come to believe the named Ortho's (Granada, Credenza, etc) had the brass and the #'d (8-12, 8-30 etc) had the pot metal. Is this correct? A few questions.
1) I took the back panel off but there appears to be another panel that's screwed and nailed on. Do I need to remove this for the flashlight test? I would think this is also glued on to make it air proof.(hold off till I get OSB, motor running-Thanks Gene)
2) Is this the brass or pot metal OSB and does anyone have one for sale? Preferably rebuilt but will possibly buy one that's not. Also missing one door knob. (I will be posting in the trader section if I don't receive a PM here)(pot metal thanks Gene,Winsleydale)
3) How do I remove the tone arm from the bracket? It is a very loose connection. There seems to be 2 screws(I took out) and 2 rivets on the underside. Should I buy a new one with those cracks? I see they go for $70 or so.
I will take more pictures if requested tomorrow. Any questions, criticisms are welcomed. Thanks in advance. Gary
In short, is not liberty the freedom of every person to make full use of his faculties, so long as he does not harm other persons while doing so?
Frederic Bastiat