LOL, I did the same thing with wood dowels for my Chrony. A solid hit on the metal stanchion would damage the plastic part it was stuck into.The crony was a pain to set up and use, I only shot one of the bars once and replaced the aluminum ones with wood dowels so that the next time it happened they would shatter and I had spares to replace them. A couple of times the muzzle blast blew it over
The Chrony were great for their time but they have been surpassed by newer technology. There is a reason we are not all driving Model T Fords. Chrony's fell over easily, they got shot, they didn't work indoors and they didn't work later in the afternoon when the sun was low on the horizon. The Garmin has none of those problems.
Another good reason to own a chronograph. Some people are just determined to live in the past.To the comment about not needing one....the first time you don't make power factor at a handgun match, you'll decide you do need one.