I broke the threaded end off one of the 1/4 x 20 shoulder bolts on my puller. I found an exact replacement, except the threaded end is about 1/16″ shorter; found online at McMaster-Carr. Like the original, it has a 5/16″ diameter, 1-1/2″ long shoulder. It is their part number 91259A587. Cost is $2.11 each if you buy 5 of them, or $2.46 for one; plus shipping. Website link to their grade 8 shoulder bolts is: https://www.mcmaster.com/products/screws/shoulder-screws-2~/alloy-steel-shoulder-screws-9/
Dave
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