@Micky Duck photo as promised. For anyone attempting the same, this is what I used. Handy bit of metal lying around, angle grinder with cutting blade, bastard file, 2mm drill bit (several actually) and small bolt cutters. Blade measures .365 from top of foresight ramp to top of blade. I cut the existing spring in half with bolt cutters (really tough bugger side cutters not up to it). Placed half spring on front screw instead of rear. Cut blade to measure so sits flush on top of rear screw and rests against rear of front screw, Half spring produces sufficient tension so blade doesn't move. Cureently shoots 3" high at 100 meters with skinner sight as low as it will go. That was with factory ammo. I'll see what it does with my home loads before I muck around anymore.
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