The CNC itself works ok. But modification is a MUST to fit the spinner into the holder. DO NOT BUY the laser add-on, at least not from this seller. I paid extra $150US for the 15W laser. Seller sent a laser unit NOT able to work with the CNC. The product page showing one WILL work with the CNC but shipped a different one. 1. physically too big to fit in the holder (seller respond was to jam the holder open and sand the holder down). 2. the laser requires it's own 12V power supply. Seller did not provide. CNC has a 24V power supply 3. the CNC only output PWM 3pin to control the laser but this laser unit only accept TTL 2pin. Tried, doesn't work. 4. seller did not provide either 2-pin or 3-pin cable Seller insisted "it will work ... I just need to do a little extra work myself" and refuse any refund. With AliExpress dispute stepped in, I only able to get $85US refund with a unusable $150US laser. I am not even able to test is the laser unit working or not.
You may see this laser unit needs it's own power supply and requires a 2-pin TTL input.
info about collar and nut was not available , i would prefer extra information about force pushing collar into nut , a wrongfully assumed that the nut was wrong . but friendly contact solved problem , so happy after all! thank you , regards , chris