Ellacombe Apparatus
The "chiming" mechanism in the vestry of St. Mary's Belchamp Walter is a Ellacombe Apparatus.
Renovation of the ropes
On the bequest of one of the churchgoers the ropes of the Ellacoombe Apparatus were replaced. This is particularly evident when you are in the Bell-Ringers chamber (Silence Chamber), especially now that it has been cleaned. You can see how the ropes are fed to each bell in the belfry floor from below via a series of pullies.
While the bells are no longer hung so that can rotate, they are protected from falling into the tower below by wooden beams in the belfry.
The ropes shown in the photo above connect to a "ringing mechanism" at the bells in the belfry via a series of pullies.
The position of the "ringing mechanism", or chiming method, depends on whether the bells are intended to be rung
by their "convntional" method, i.e. the pulling of the bell rope that can rotate the bell at least 180 degrees.
The tufted woollen part of a bellrope, used to provide grip when ringing a bell, is called a "sally".

The photo above shows a "chiming mechanism" that is presumably one that would allow "Change Ringing". Again, I reference DAC, Change Ringing is where a bell is rotated on a pivot and controlled by a rope connected to a wheel.
Change Ringing
The decussion here is that if the mechanism to strike the bell is placed in such a way that the bell could not be swung through 360 degrees as the striker would be in the way of the moving bell.
The chiming mechanism that allows the rotation of the bell on a fulcrum means that the striker is sufficiently remote from the bell so as not to obstruct the bell as it rotates. It is probably the case that this way of chiming creates an undue risk on damaging the bell. An alternative method needs to be provided so this does not happen.
This alternative method could be a mechanical or electro-mechanical device. I am also assuming that an internal chiming mechanism would be preferable. This is particularly the case in Belchamp Walter as there is limited space in the belfry.

Above is an External Electro-Magnetic chiming mechanism. Below an internal mechanism.

Background to this page
Having seen some of my history pages being found by those making an Internet search I have decided to add a bit more context on how the pages came about.
This page is linked from the BW Bells page. As it had been referenced by a Facebook user, I thought that I should update it.