Know this is an old post, but for anyone with a 1210 looking, I have a little advise.
When you split a 1210 Hydrostat, you need to check your Drive Rod. The end connected to the Hydrostat strips the rod out of the aluminum tie rod. Mine did just that, I JB WELDed the tie rod onto the rod. In the pic you can see the tie rod, in the hydrostat lever. Just make sure that you put it back on with the same number of turns, that it took to take it off with.
If it were me, I would remove the tie rod and lay it a 1x4, then lay a 1x4 piece on the long 1x4 on both ends. What your doing is making a JIG. screw the small boards to the long board, then you can lift the rod out. Unscrew the end that was fastened to the hydro(red pump), put your JB WELD in the end and screw it back on rod and place back in jig to make sure the length is correct. Look at second pic, notice that one tie rod points up and other points down. Make sure yours does the same and only jb weld the end, fastened to hydro. You might need to adjust it one day and it will be the end under the plate that you would adjust.
View attachment 508829 Hydro pump, the rod is fastened to the gold colored lever.
View attachment 508830 notice the direction of the ends, opposite each other.
Its not a bad job splitting.