what size are the bolt to mount the laser? I have one that is a 1/4 inch too short
From here, it looks like an M5 x 30mm. I would use a locknut instead though.
Come to think of it, the math doesn’t add up. Those plates are at least 3mm each. Add the 2.5mm or so spacing between plates and the aluminum extrusion and the extrusion itself gives (3 * 2) + (2.5 * 2) + 20 or 31mm. The bolt should be at least 35mm.
maybe ust take a good one to your hardware store 
I dismounted it and tightened all the bolts and now it fits. Thanks all
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Could you take a few moments and from the selection at the bottom of the message box ( may be under the dots ) you will see a SOLVED / RESOLVED marker, please select it so that when people go through they can find the messages with answers. Thanks and Its good you have an answer
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