Hi,
What is the size/dimensions of the bolt/screw that is used to lock the gantry arm in place. There are bolt-holes on the right and left side of the gantry which appear to line-up with holes in the middle of the glowforge, just between the belts on the left and right side of the enclosure.
I assume I should be able to line-up the holes and screw in a bolt. I just don’t know what size bolt it is.
Welcome to the forum.
When you received your Glowforge you should have unpacked the bolts in question. If not, you can use calipers to measure the holes. I am not sure what you are trying to accomplish. I assume you mean these. 
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Thank you. I didn’t realize that it was a custom bolt. I’ve determined that the bolt is an M8-1.25
Thank you for the help @dklgood! You are able to purchase the Important Orange and Red Bits in our Shop - here. I’m going to close this thread - if you have a new question, go ahead and post a new topic.