I have a PL5 head and the period tripod it came on. On mine the tripod column top disk is not removable, so my guess is that your tripod is later than the head. Whilst I do have a brass collared screw which will work on the PL5 I've found it easier to use a long Arca style clamp fitted to the head via several 1/4" Whitworth~ (1/4" 20tpi) bolts and then fit cameras with Arca style bases. This makes life a lot easier and buying the clamps and bases off ebay means that they can be bought quite cheaply.
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