I just purchased a 4 glass clock with the movement represented by Plate 1419 in the Horolovar book. I cleaned the movement and went to the book to get the spring size and length. I'm missing the bottom block and tried to find out what shape/size to get. The description on the Plate1419 was a disc or 4 ball pendulum. I have a temperature compensating chronometer disc. Is this a problem? On page 196 plate 19 shows a disc associated with Plate 1419. Mine has a similar center piece but a two metal ring. I don't have the capability to photograph the movement. When I do I'll post them. Any hep would be appreciated.