Does antiskating matter with spring disabled?

>>"I am planning to use Expessimo counterweight with Rega arm.With internal spring disabled do i need to touch antiskating?Thank you."<<
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Like others that have posted, I believe you meant the VTF dial.

Here is what the lit says in regard the the Rega RB 300-600-900-1000 arms.

"For optimum performace on RB 300-600-900-1000 set dial pass 3 (this locks the spring down to prevent spring vibrations down the arm tube) then set tracking force with a gauge."

Thus moving the Heavy weight on the arm tail shaft for the proper tracking force.
Jim

Why do you want to disconnect the antiskating?
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>>"I am planning to use Expessimo counterweight with Rega arm.With internal spring disabled do i need to touch antiskating?"<<
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You do not need to do anything with the antiskate. That is separate from the VTF spring that the "Expessimo counterweight" literature is talking about. The antiskate control slide lever is at the base of the arm support.

Here is what the lit says for adjustment.
"Set the bias adjustment knob to the same number as the tracking force. Note: This setting is not critical and a figure of 1-1.5g will normally be suitable for moving magnet cartridges and 1.5-2g for most moving coil cartridges."

Where ever you had it set before the Heavyweight just leave it there.

As far as needing antiskate for the Rega arm I can't say. I believe some VPI arms do not have any antiskate control.
Jim

Dougdeacon, Sorry, I just assumed he would set the antiskate to zero to set up the VTF. It would be a little tough if he did not.

I will concede you know a hell of a lot more about TTs than I do. Thats a given.....

As for some of the VPI arms not having antiskate control though I do not have a VPI, I have read that from their literature. And yes I know about the twist the wire thing.
http://www.vpiindustries.com/faqs.htm#faq1
Jim