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the beauty of imperial measured bolts is that there are only 2 threads for each size bolt
so if it is 7/16 bolt it will be either unf or unc one thread is fine (unf and most likely) and one is course (unc)
however if it is mtd make it could be running metric in which case the bolt will be ( if 7/16) 11.11 mm in which case the thread can be 1.25 or 1.5 or 1.75 pitch
might have to talk to a mower shop that sells mtd and get the size bolt from them
If the thread breaks at the needle and is feeding smoothly from the spool, you may have the tension too high. It is impossible to say what the setting should be because the knob rotates all the way around several times. Loosen it off until you see needle thread pull to the back of the quilt, then tighten until it just balances the interlocking of the stitch in the fabric. Test with little swirls, that's most likely to pull needle thread to back.Also, check that the needle is properly installed and that the hook to needle timing and clearance are good.Nesting of thread underneath usually happens if the foot lifter is left up or the tread is not fully in the disks of the tension unit.
Oct,11/10,, First you need to know it the item is European or Japanese which all use Metric threads. If it is USA it probably uses Imperial threads which are fine or course. England (British) also have fine and course but not interchangable because thread angles are different. Anything of Japan older than 1967 also uses Metric but not the same metric as 1968 and newer. In 1967 there was a world conferance that was "ISO" international standard organization. Some Metric stayed the same but in small sizes under 6 MM, the 5s, 4s, and 3 were changed and all these have a tiny raised or indented dot to tell you they are the new thread. Some motorcycle parts use special not common threads to prevent you from using a cheap poor qualiy nuts or bolts that might fail when in use ( steering parts or brake parts on a car). Occasionally you might use too long of a bolt or screw and it may extend and break something else. Before 1901 most mechanice were called FITTERS because there was not many standard parts and everything had to be fitted. Henry Ford helped make things interchangable so we call them standard parts. If you could give some rough dimentions of the screw ( 3/16" long by 1/8"...or 5 mm by 13 mm long,,, or other American sizes are size 6X32 or 8x32 and different lengths. This would help. Can you find some old fellow that lives on a farm and he might be a mechanic and can figure what you need. Good luck, EEL
I like this question as it poses quite a challenge! Older Echos have the left handed threads on their crankshafts (and possibly even now)...but the shaft off the gear head would really confuse people who can't remove the head anyway if it was LH and that job in itself is a challenge also. Do you have any hardware that will thread onto it?...never seen an old Toro before! yes, 3/8 24 is a pretty standard SAE size...but certainly the Toro shaft could be close to that and some other size entirely > I hate to think in terms of metric on this.
Can you possibly take a picture of another nut on the carriage that matches the one you lost? If so I can probably guide you better.
I don't know where you live but try taking the stroller into a hardware store that has a large selection of both Metric and English hardware. Threads sizes are all standardized and so are the nuts. But there are just different styles to pick from. You might be able to find the right thread size but he nut won't quite look like the original. And the question is does it matter? Look for a self locking nut also. One that has a "nylon" insert often called "Ny-loks". Keeps the nut from coming off. Get the right size you might want to replace all of them.