Modified Knosti Clamp

Modifications to the Knosti clamp.


After cleaning many records with the Knosti Disco-Antistat the one problem that stands out is the ingress of fluid onto the record labels.

The Knosti clamp can sometimes leak, the fluid may then leave tide marks on the label, with the colour leaching out into the cleaning fluid.


Over a period of two years my modifications to the clamp have improved the performance to such a degree that the problems have almost entirely disappeared. The ingress of fluid is quite often due to the label being clamped on its edge.

The clamp is tightened against  the protruding edge of the label, thereby allowing the fluid to soak into the label.


My modifications include a larger clamp area coverage from 100mm diameter to 102.5mm diameter. Extra coverage allows for just-off-centre labels to be covered; unfortunately some badly skewed labels can not be entirely covered.


The protruding edge is removed from the Knosti clamp and a LDPE (low density polyethylene) cap is glued on with a special glue.

The LDPE cap is a soft, pliable material that helps the clamp adapt to the vinyl record and gives the clamp a much better chance of resisting any leakage. The edge of the LDPE is 1mm wide, very flat and polished to improve the seal; tests show this to be very important.

Every clamp seal is checked with a magnifying glass before despatch and comes with a three year guarantee.


After cleaning many records my results are 99.9% positive - PROVIDED that the label is not too much off centre.

CAVEAT:  Clamped records that have a label which is visibly and obviously off centre will almost certainly have ingress of fluid into the label. Records that fell into this category were not included in the results.



Other improvements:

1 ).  Threaded section of the clamp has been removed and replaced with extremely strong and tough material that goes by the name of 'chemical metal'. This rock hard polyester material is moulded to the shape of the thread on the spindle.

After making a thread the clamp can be done up tightly to give a much better seal without the prospect of damaging the thread or spindle.


2 ).  Embossed arrow has been removed because it grinds into the side of the plastic bath leaving ground off plastic in the solution.


3 ).  Clamp is narrower and has more lateral movement (about 2-2.5mm). Extra lateral movement accommodates warped records and gives warped records an even brushing over a larger area of the vinyl.


4 ).  Red and white dots are painted into shallow dips drilled into the plastic, dots are on one side of the clamp and opposite one another.

The benefits:  

a ). Know which way around the clamp is!

b ). Count how many revolutions the record has been turned

c ). Soak a predetermined section of a vinyl record if that section has particulates that are stuck in the grooves      

   thereby easing the particulates out from the groove; does not always work but worth a try!


5 ).  Spindle is glued to the side of the clamp instead of using the 'push and click' fit; this gives a more stable and secure clamp with less chance of the clamp coming apart while doing-up or undoing.


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© copyright MAF Products 2010 - 2021

This modification to the Knosti clamp is of my own design and NOT a modification by Knosti



      Modified Knosti Clamp


VRCC (vinyl record cleaning clamp)

VRCC photos

'Click' on link for pics/diagrams/pricing:

Modified Knosti Clamp photos


(vinyl record cleaning clamp)

Bespoke designed, hand made, vinyl record cleaning clamp

To fit Knosti bath - MK1/generation1 & MK2/Generation2                          


Utilizing high quality materials for a long service life - VRCC is guaranteed for 5 years


Components made from:  LDPE [low density polyethylene], acrylic, Stainless steel, Galvanized steel, Brass

Aluminium, Nylon, and Polypropylene



LDPE [low density polyethylene] - superior seals for a long life,  Acrylic side plates,

Polypropylene caps filled with resin with rotation 'grip' edging and rotation markers,

Threaded brass rod with fixed brass tube end and fine thread for incremental pressure activation,

Aluminium centre hole locator for vinyl records, Stainless steal insert with capture area for spindle,

Pinhole to stop a vacuum from forming,

Threaded spindle end with nylon 'grip' for MK1/Generation 1 Knosti bath.

Threaded spindle end with brass & stainless steel handle for MK2/Generation 2 Knosti bath.

Threaded spindle ends are interchangeable.


Vinyl record label is fully encapsulated, leaving a small gap between label edge & clamp edge,

no contact is made with the label. Some off-centre labels may not be fully encapsulated.


LDPE seals include a large clamp area coverage from 100mm diameter to102.5mm diameter, extra coverage allows for just-off-centre labels to be covered. Unfortunately some badly skewed labels can not be entirely covered.