This one has been worked on in the past .The trigger return spring is wire not the flat spring version .That screw has a thoroughly wallowed out slot- evidence of a past battle.The slot can be recut so I can obtain a purchace on the screw and get it out hopefully. Harry ,I apoligise,you are using a modern vice grip,I had in mind an older end gripping minature vice.Good tip.Thank you,Hugh
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