I have in my posetion a v. near mint 1978 Planar 3, however the R200 antiskate is stuffed and will not play without skipping, I do have a J7 rewired RB250 and an RB300, which should I fit?
bearing in mind the other will go on my Rock II.

The 250 originally came off the Rock, so I'm thinking put it back on and put the 300 on the Planar as the later models had these fitted as standard.

Then I can get the R200 seen to.