Can't you do what they did with the Syrinx PU2 with the additional Mass ring, this would be the best way for obvious reasons.
Yes, they do, but based on the price of the standard one it would be at least £50 delivered inc. VAT. I had/have bought one off ebay for £20, but the seller has been an f'in nightmare, took ages to send it, and then when it came it wasn't the heavy (140g) one at all, but a standard one at 108g! So now looks like I will have to go back to the drawing board I suspect. To be fair, the 50ps white-tacked to the end hardly notice anyway... I may just find a suitable cover instead. (Been trying various platic bottle tops eg. fabric conditioner, one of which may actually work ok trimmed down and sprayed silver!)
The Syrinx was slightly different, as the mass ring fitted over the whole lateral bearing assembly, giving asymetric inertia - more lateral inertia than vertical with ring fitted.
I wish SME would re-consider their spares pricing structure. It's not as if dealers have huge margins on their products either I understand ;)
Latest weight
A 150g in Tungsten copper alloy for a SL-1210 for a chap in Italy.
Rather interesting idea - 3 extra holes for grub screws to add / remove weight!
Unfortunately he had to wait a while as the belt on my lathe broke and I was waiting for a new one to arrive before I could finish the piece.
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Hi Steve, you certainly do a very neat job :)
I might need a new weight machining for my Aiwa AP2600 which is fitted with a standard arm. That may one day change.
I guess i'll find out when i fit a Sumiko headshell & a modified Denon DL103 :eyebrows:
Now from what i gather you don't trust the standard adjusters & you like to directly connect the counterweight (though possibly via a nylon bush?) to the arm proper?
If that's the case & i work out what mass i need, if i measure the arm with a micrometer would you be able to machine a new counterweight for me or would you need other information?
Thanks in advance :)
It depends on the stub arrangement. My PL-71 arm has a damped stub and a weight carrier with spiral adjuster on the stub - weights just need to sleeve over that and grub in.
Other arms are simply counterweight grubbing on to arm stub like Rega.
It was the Alphason arms that had a nylon inner sleeve with the grub acting on the nylon to clamp through to the stub so I copied that arrangement.
Making a a spiral screw to work like the commercial arms have is beyond my DIY set up so it's choose from one of the above.
I think there is definitely something to be said for damping the stub or the CW in some way on some arms.
If you know the weight and outer and inner diameter needed I can calc the length to get that weight. Brass it has to be as I don't want to machine SS and the Tungsten copper alloy is only a special order and will be a lot more expensive.
Latest work - a Rega R200 12" conversion.
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First remove the old butt plug and cable
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Wand fitted & wired with Silver Litz
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Then a counterweight
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and a VTA adjustable base (the original was plastic and you had to add or remove bits making it very crude)
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Cardas din plug
Awaiting the 90deg angle socket to finish the project.
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Nice job :)
Regards D S D L