The model is a GC30S-3. Serial of 06-01660, I'm doing that from memory, as I'm not at the shop now. I did mention it was a full free triple mast, new carriage chains last month, upright chains done early this year, cam type adjustment on upright chains. All adjusted correctly, mast vertical, heels just off ground, removed carriage from mast and secondary's still slam. It's like the return flow is not slowing the secondary's.