by Bill Bowley » 31 Jan 2012, 12:35
Kipper,
The design of the section where the arm 'mounting' attatches to the cross shaft is the same as the set up on the Burns Marvin and any other Burns using the RezoTube trem sysytem, so I would suggest that a few simple modifications to a possibly 'badly manufactured' item would solve your problem cheaper than a full replacement with another design(I have never had any problem with a Marvin arm slipping). Perhaps the unit was manufactured with a less than the required width 'adjustment gap' on the 'grip ring'. I would suggest that you remove it, remove the tightening screw and using some metalwork tools widen the gap, which on reassembly would then allow the clamping ring to exert enough pressure to 'stay still' and not slip. If you can't do it yourself, I'm sure that a small amount of 'readies' would get it done by a local engineering firm.
There is of course the possibility that the gap is correct, but the internal diamer of the grip ring is oversize (or the shaft undersized), that would require internal shimming at the very least.
Another possibility is too much pressure on the spring, possibly adjusted too far.
That's my 'long distance' best guess at a solution anyway (what I would do), hope it helps.
Regards
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