The Karver lock system did not latch off when tested yesterday, it needs servicing. This is why it was not possible to off hook the mainsail recently causing a lot of trouble as the halyard tension was increased to break loads with no effect.

 The masthead platform allows working efficiently at head of mast.

The new slider and attachment shown in full hoisted position. The slider is lashed to the shackle.

 

The new VHF antenna bracket is fiberglass and provides full electrical isolation from the mast.

 

 

The fitted slider has a diameter of 12mm and length of 12cm, it is latched directly to the shackle using M5 screws filed to 4.5mm. The track slot is 5mm. The track itself is around 12.7mm diameter or half inch. The precise measurement is difficult.

 The bottom slider has a wood handle to sandpaper the track. The top black slider is the original plastic coated slider which jammed. The VHF bracket is on the left. The red container is Swiss cow milking grease, it could be a good replacement for McLube.