Nice job you did on your stand, 410-er! :thumbsup:
Support under the wood spur as you mentioned would not be a bad thing, but from sad experience I can tell you that the weak spot is in the wood opposite the lock mortice.
What I am about to suggest may well be considered blasphemy :surrender: , so I am just presenting an idea for your consideration and then I'll crawl back under the bed. You might think about a leather-covered solid support under the front sight as well as additional support under the spur. :hmm: This would divide the force exerted upon the pistol when short-starting and then seating the ball.
I've thought of cobbling up something as I have just described, but I haven't found one of them round "tuit" things I need to enable me to proceed. All the "tuits" I have are square. :grin:
Again, congrats on a very nice job.