How do YOU set VTF on your Rega arm??

I am confused about the spring loaded adjustment for VTF on the RB300, which I am not familar with. Can you please explain the use of this adjustment on the RB300.
Miner42

Here is info that came with the Expressmio "The Heavy Weight".

[Quote:]
For optimum performance on the RB 300-600--900-1000 set the dial pass 3 (this locks the spring down to prevent vibrations down the arm tube) then set tracking force with gage.
[End of quote.]
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Follow Sunnyboy1956 directions from his post.....

09-20-07: Sunnyboy1956
--- and finally installed the Expressmio counter weight. I ended up setting the VTF counter on the RB 300 to max ie 3.5gm and then adjusted the Expressmio to achieve the recommended VTF of 1.6 gm for the Lyra Helikon using a Shure stylus gauge.
Sunnyboy1956

I don't have a 300 now to check, but I can't believe that on max, the spring is "Locked" down. If it were, it couldn't function as a spring. Perhaps the resonant frequency is changed and if it is, it would change for the higher which is not good at all. Setting it to zero, gets it out of the system as I remember.

You can still use the spring mechanism if you damp it.It is possible to put felt or foam in between the coils of the metal spring thus stopping it resonating by itself.Also it is necessary to use that mechanism if you properly use it to adjust tracking force for the requirments of each record,given that each piece of vinyl is different.It is then that the beauty of the mechanism is realised.I use it virtually "on the fly" all the time.You have to hit that spot.

I don't have a 300 now to check, but I can't believe that on max, the spring is "Locked" down. If it were, it couldn't function as a spring.

>>>>>

It is not acting as a spring. Think of it as being disabled. You are setting the VTF with the counterweight only.
============

Perhaps the resonant frequency is changed and if it is, it would change for the higher which is not good at all. Setting it to zero, gets it out of the system as I remember.
Stringreen

>>>>>>>>>>>>
I can only go by what Expressmio says in their lit.....


[Quote:]
For optimum performance on the RB 300-600--900-1000 set the dial pass 3 (this locks the spring down to prevent vibrations down the arm tube) then set tracking force with gage.
[End of quote.]
==============

I can't comment on the theory or why it works but I tried both options : namely using the dial counter on the base of the RB 300 ( its a tiny black dial) to set the VTF using the Expressimo only as a balancing counterweight.The second option which I found clearly superior was to set the VTF using the Expressimo with the dial counter at 3.5gm. Believe me the difference is not subtle. The bass definition and general LFE was way better.
In case of any doubt, send me mail and I will be delighted to help.
I don't see why this option can't be used even if you don't own the Expressimo.It does't cost to experiment !!