I see that now. That tiny collar with only 3/16" of length going into the tonearm collar has to hold up the entire CW and shaft. Holy cow, not good at all.
And to boot, my small collar is .010 smaller then the mating hole in the arm.
Can you say "slop".
That would be the best way to do it.
If a new brass bolt could be made with a similar thin flat head and run it thru the inside of the tonearm collar, then add the new rubber insert, screw the CW mounting shaft on, lock down the single set screw, it would never sag again. The only thing would be to make sure the head of the new brass bolt doesn't hit anything when the arm pivots up and down.
Does that make since?
Everything would be pulled together from the inside of the large tonearm collar. Those 2 screws on the bottom and that little tiny collar wouldn't be needed any more.
Steve
The square end I believe is to grab into the rubber to prevent spinning OR allows horizontal and vertical damping only, since these are the directions that need damping first from the cartridge.
Not really sure about the last idea since many tonearms globally dampen with no issues.
You need a collar of some sort for simplicity's sake and the set screws just make it easier.
Don,t forget the bearings are delicate and need a delicate touch, so anything forced in or manhandled here needs to be avoided, and the 2 bottom screws accomplish that.
Regards
David
Not really sure about the last idea since many tonearms globally dampen with no issues.
You need a collar of some sort for simplicity's sake and the set screws just make it easier.
Don,t forget the bearings are delicate and need a delicate touch, so anything forced in or manhandled here needs to be avoided, and the 2 bottom screws accomplish that.
Regards
David
Hi David,
I get that now looking at your previous post and photo again.
My rubber bushing is broken in 2 pieces and the small piece is stretched out of shape. I didn't know my small broken rubber piece goes under the head of the brass bolt. I see that now in your photo.
Without your rubber bushing installed on the bolt, does the head of your brass bolt lock into the teeth on your small collar or does it just spin?
My brass bolt without the rubber bushing installed does not engage with the teeth on the small collar, it just spins. Is yours the same?
If so, it must be that the head of the bolt compress's the rubber bushing into the teeth of the small collar and keeps everything from spinning.
Does that sound about right?
I really appreciate your help saving my tonearm.
Thanks David,
Steve
I get that now looking at your previous post and photo again.
My rubber bushing is broken in 2 pieces and the small piece is stretched out of shape. I didn't know my small broken rubber piece goes under the head of the brass bolt. I see that now in your photo.
Without your rubber bushing installed on the bolt, does the head of your brass bolt lock into the teeth on your small collar or does it just spin?
My brass bolt without the rubber bushing installed does not engage with the teeth on the small collar, it just spins. Is yours the same?
If so, it must be that the head of the bolt compress's the rubber bushing into the teeth of the small collar and keeps everything from spinning.
Does that sound about right?
I really appreciate your help saving my tonearm.
Thanks David,
Steve
Attachments
The entire brass insert must be isolated from the collar. It cannot touch any solid structure.
Its purpose is damping micro vibrations that the cartridge generates on its own.
The energy a cartridge generates is much more than you would imagine in its own little world and needs a source to dampen and not reflect back down toward the cartridge again.
That square end must not touch collar while operating.
When you screw the counter weight stem back on the brass bolt, you slightly squeeze the rubber and tighten the single set screw and this compression keeps the brass from turning while you adjust the counter weight for cartridge tracking force.
Regards
David
Its purpose is damping micro vibrations that the cartridge generates on its own.
The energy a cartridge generates is much more than you would imagine in its own little world and needs a source to dampen and not reflect back down toward the cartridge again.
That square end must not touch collar while operating.
When you screw the counter weight stem back on the brass bolt, you slightly squeeze the rubber and tighten the single set screw and this compression keeps the brass from turning while you adjust the counter weight for cartridge tracking force.
Regards
David
JVC UA-7045 Antiskating
I did remove my Antiskating knob and the spring shot out and I don't know how to put it back. Any idea's Thanks
Thanks for your reply. I think I have figured it out. The reasonI got into this mess was that I am rewiring the tonearm and I couldn't get the wire through the tube. I have now discovered why. Inside the whole length of the tube is a long piece of square shaped felt, once you take that out it is easy.
I also have a Sony PS-X75 Biotracer that I am working on so I am always looking for advice from people with the same problems as I.
Regards
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