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Carefully put a small slot in the male thread using a dremel, then you should be able to use a flathead screwdriver and use that to hold it while you spin off the nut?

I don't have a way to grab a hold of the nut because the knob around it is spinning on the nut. The bolt in the center doesn't spin.


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I don't have a way to grab a hold of the nut because the knob around it is spinning on the nut. The bolt in the center doesn't spin.


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See if you can get some super glue to soak down between the knob and the nut maybe it will stick well enough to make it come loose
 
I'm thinking it's a 740 with a mc75 kart motor installed. There is an 18" bar from a Mac 250 on eBay that I may buy for it. That's kinda small for that saw tho. Do you guys have any ideas about the air filter knob on the castor?


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Or take a very small drill bit and drill down on the top of the nut just where the plastic begins and tap in a small roll pin
 
Hey--Thanks for the info--Went and looked my ms 390 handle has a black top with a orange bottom. I am still happy with it for what I paid!!! From this day on it shall be called a limited edition model--Only 2 exsist and 1 was stomped to death by wild bison.
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Yup the 391 is largest clamshell they make. It was my first Stihl saw :)

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The last family photo before the 440 traveled up north. Just went and priced a dual port muffler cover for the 660. That's my baby :)

Edit: @46 Poulan if you notice in the picture the handles of the saws. The two on the right are pro grade Stihls. The top of the handle has a black back strap and the rest if white. The 391 is all white and it's Farm and ranch. Then the 170 is homeowner series and all black. Some variations of homeowner are orange and black. But if you see that black backstrap on white handle that indicates a pro saw but everything I've seen
 
They changed the clamshell saws to white handles when they went to the 1 series saws my 271 is all white is sposed to be farm and ranch. Thwy also went to spring av mounts which rock over the rubber isolaters
 

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