To adjust your clock so that it runs faster, turn the nut on the bottom of the pendulum to the right; left to make it run slower. Use care not to raise or bump the pendulum [excessively] so that it doesn't knock it out of beat or worse yet, fall off!
Care should be exercised when pulling or winding weights not to wind them so high that you can't remove them in the event that the clock needs to be moved or serviced.
The pendulum and weights need to be removed before a clock is moved. If a large clock such as a grandfather clock is moved beyond the confines of your home, say across town or out of state, I advise you to contact a clock technician such as myself to prepare it first.
There are basically two things that keep a clock from running. 1. lack of power 2. being out of beat. Lack of power is the result of one or more conditions, but most often it is due to lack of (or contaminated) lubrication. Another cause is worn pivot holes or bushings. Being out of beat is the result of the pendulum being handled too roughly or the clock being moved. You can listen to the "tic-tock" sound to determine if it is in beat. You should hear an even space in time between the two. If it sounds uneven like tic...tock.......tic...tock instead of tic...tock...tic...tock, then it's out of beat. If it's a small clock, sometimes this can be remedied by placing something under one side or the other of the case.
Over-winding a clock is like clenching your fist too tight; it will only go so far! That is a common misconception for why a clock won't run. See the paragraph above for the most common reasons for a clock to stop.