Here’s an Ithaca grandfather clock I repaired in July 2013 (and I did another one last month). William L. Gilbert Clock Co. made the movements of these clocks, as discussed in Ithaca Grandfather Clock with Gilbert Movement.
Repair job 6121. I polished the pivots, installed 12 bushings, replaced the time mainspring with a 3/4 x .0155 x 120 inch spring and the strike mainspring with a 3/4 x 0.0159 x 120 inch mainspring. A previous repair shop had removed the escape wheel cock and poorly reinstalled it and bent it. I straightened it (to make the escape wheel arbor upright) and mounted it neatly.
Repair job 6214. I polished the pivots, re-pinned one pinion, installed 14 bushings and repaired the split cannon pinion as described in Ithaca Grandfather Clock with Gilbert Movement.