Record Clamp for Rega P5?

Like revdeg I also use the Souther Clever Clamp and like the results with my P25.

Try a Bren1 record clamp. Works with a Rega, only 13oz.

I'm using the Michell "R" clamp on my P5 (got it from Music Direct) -- it's light in weight (delrin body and anodized aluminum knob) and doesn't figure to put any undue strain on the motor. I tend to use it only with warped records, and it seems to help some (makes me feel better, anyway).

I also use a Michell 'R' on my Rega P7, but only for warped records (only helps when warp is concave - a periphery ring is needed for the convex side).

A groovetracer sub platter will fix the spindle length problem (and the out of round/runout issues with the standard rega platter, and you get a better bearing to boot). I use one of the featherweights Clamps from TTWeights, it weighs about 180g, super light, so perfect for the rega where you really don't want anything heavy. I only use it on warped records and it absolutely helps. The design of the clamp on this one very well might work OK on the stock spindle, the clamping mechanism is right at the base of the clamp. BTW, both the sub platter and the clamp are amazingly well made. I have a p3-24.