Hi Folks, Anyone familiar with the later Hermle movements such as the 1151's, 1161's, 451's etc etc will have noticed that the older slotted machine screws have been exchanged to the hexagonal machine screws in the chime stop, chime count components etc This is an improvement but i am having difficulties in finding the correct size Allen Key! I have tried a 1.5mm key but that is slightly too sloppy... it tightens but not enough! I then tried 1/16th inch key but that appears to be just a fraction too tight. It does enter the screw but doesn't fully locate so there's a risk of rounding using either of the above keys. Can anyone let me know what size Allen Key is needed?? I think the machine screws all the same size. Thanks as always.