If the shaft properly fits the head thee should be no “lean” when curing. If the shaft is a little loose, there is Quick Center that you can use to help the shaft maintain it’s center. Always position the head down to cure. The club head can sit in the playing position on the ground, with the shaft leaning up on a workbench, counter, etc. Best to have a slot or rack that prevents the shaft from sliding off the bench or counter. Hope this helps.