Shimano derailleur limit screw size ?

Bullpup

Senior Retro Guru
Good afternoon
I have several Front and Rear Mechs with chewed or missing limit screws.

Does anyone know what size they are please so I can find suitable replacements and fit new ones rather than continue to cannibalise?

Many thanks
 
The Shimano screw has an unusual Japanese-spec crosshead top to it (which is why they always get mangled, they are not Philllips or Pozi). But it's a standard M4 metric thread.
 
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