shutter release thread size

can anybody tell me the thread size of a shutter release please i have a copal 0 shutter but the thread on the shutter release tab isnt very good so i need to tap a new thread can any body help all the best ,wayne

The threads on a shutter release are tapered so a regular tap can't cut new threads in it. I think you'll need the services of Grimes or Flutot to repair that if you can't find a good part from an unrepairable shutter.

You would think that a taper tap of the size to fit the common cable-release tip would be a common item. But it isn't.... at least I've never seen one. I would buy one instantly if I could find it.

Copal shutters sometimes have female taper threads and sometimes female straight threads. I don't know what the pattern is. Full elegance would be to use a taper female thread with the taper male thread of the cable release, but cable releases thread just fine into the straight thread. Probably some of you have shutters with the straight thread and have never noticed.

The thread data is on the web at the site of the US distributor: http://www.rtsphoto.com/html/copal2.html. The straight thread is 3.2 mm dia x 0.5 mm pitch. (Once 0.75 is listed, very likely a typo.) The taper thread is called out by referring to a standard: "Taper Screw JIS B7104-1971". I have no idea how to obtain that, or the tap for it.

Even a 3.2 mm tap probably isn't easy to find, but 3x0.5 is a standard size, which would probably clean up damaged threads on the straight threads. Or you could just buy the replacement part since it just screws on.

Not cheap, but you can buy replacement sockets for Copal shutters. Here's the link from B&H: http://www.bhphotovideo.com/c/product/447409-REG/Copal_COCRS_Cable_Release_Socket_for.html

I imagine you can find these in the UK also.

thanks all, looks like i will buy one instead as it seems easier