Lost Thorens TD135 tonearm stub screws. Help

Hi I have dismantled the BTD 12S tonearm on my Thorens TD135 , it needed a new rubber insert, but in doing so one of the securing screws pinged off into the ether. Does any one know what size these are please? Yes there is a second one but I have refitted it already and don't want to spend another hour or two trying the niggly refit again!! The photo shows where the screw will go
Thanks

Steve
 

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