This happens while it is striking the hour. Any reasons why/ Thanks! Please see the information tabs for the weight specifications required for the clock. The original 43 1/2 LPF chain slipped on several places but the 42LPF fits very well and does not slip at all. The CENTER weight runs the pendulum if the weight is falling faster than the 2 outside weights it might be that the clutch on the Center winding drum is starting to come loose and will need to be tightened up or it is damaged and will need to be replaced. To correct this problem it will be necessary to position the pin so that it can once more perform its function. The improper lubrication or lack of has become gummy or dry which can easily prevent the movement from operating properly. .wsite-menu-default a {font-size:11px !important;} The Grandfather clock weights can get stuck in the high position if over wound. With this service, we provide 15-minute consultation blocks at the purchase price of $7.50 per block. )On each swing of the pendulum, the pendulum weight drops slightly. Sure one weight set of three is less than 30 lbs but that adds up quickly in a stack of weight sets. I was convinced that the problem is caused by faulty chains so I decided to measure the links fer foot and it came to 43 1/2. Typically, what we find is that the grandfather clock has not been serviced and the oil has dried up in the movement and therefore the chiming side of the clock is hung up, or worst, worn out. The grandmother and grandfather chain drive units often do not have this feature. }}\"\n\t\t{{\/membership_required}}\n\t\tclass=\"wsite-menu-item\"\n\t\t>\n\t\t{{{title_html}}}\n\t<\/a>\n\t{{#has_children}}{{> navigation\/flyout\/list}}{{\/has_children}}\n<\/li>\n","navigation\/flyout\/list":"