Wooden clocks are driven, in the main by a single drive weight hung from a cord wrapped around the Drum, and it is this type of drive that we are going to look at in this article.
In the first clock, I ever built I used a piece of granite with a hook screwed into the top, it worked well but did not sit well with the traditional image of a clock. For a long time, my plans just included a simple Brass weight which looked the part but, to be honest, wasn't necessarily very easy for woodworkers to construct, so began a series of designs using fabricated parts and some proprietary items.
Design 1 uses a Plastic Tube with wooden endcaps and a threaded rod with nuts at the top and bottom to hold the whole together. I wanted the weight to be attached to the cord simply but a screw-in hook was not going to work with the threaded rod sticking out the top of the weight. This led to the design shown below that uses a Bowline knot on the end of the cord and a wooden hoop holding the nut inside.
With this Tubular construction, the weight is added to the Tube before it is fully assembled. My favourite weight type is of course Lead as it is the densest material that you can practically use and it comes either as Lead shot or as cylindrical weights of the type generally used for Sash type windows.
An alternative to Lead is to use Ball bearings, if bought in the form of 'Catapult shot' they will be much cheaper.
I struggled for a while to find the correct type of Knot to use to hook up the weight to the clock. The problem was that all the knots I was trying would slip until I came across the Bowline knot which is shown here, a bit more complicated to tie but once done it works a treat with no slippage.