chainsaw
I have a Ryobi RY3716 chainsaw. I lost a bar flange nut and replaced it with a non-Ryobi part (something like this one).
The new nuts didn't fit exactly, but I forced them on, causing damage. Now I can't remove them without removing the bolt they screw onto. I want to replace the nuts and the bolt with Ryobi parts, but I can't figure out what the bolts are called.
The parts manual is here. The flange nut is 678339003.
A diagram put out by the US Product Safety Comission shows that the left leg and left arm/hand are the most commonly parts of the body injured by chainsaws:
(Source: OSHA Web site)
If the dots on the diagram represent frequency of injury, protecting the left hand would help prevent a common source of injury.
The State Compensation Insurance Fund website also states that "The most frequent chainsaw injuries occur to the left leg and the back of the left hand."
The diagram on the OSHA site dates back to 1994, so it's not clear if modern safety features like chain brakes have changed the distribution of injuries.
Note that the STIHL Cut-Retardant Gloves referenced by the asker of this question only provide cut protective material on the left glove: "Engtex®, a cut-retardant material, is sewn into the back of the left glove", so Stihl too has identified this as a particularly vulnerable part of the body.
To be honest, from personal experience, I'm unsure why the back of the left hand is so frequently injured, it must be because that hand can slip off the grab-bar when the chainsaw kicks back and the hand slides into the moving chain.
Since I was curious whether or not the current injury distribution matched the 1994 statistics, I did a little more research and found a CPSC query tool that gives access to their injury data.
When running this tool against their 2012 data, it reported that the CPSC estimates that there were 30,509 chainsaw injuries, and they had detailed data for 635 cases. I downloaded the detailed case data and counted up the number of hand, wrist and finger injuries:
Hand: 54 injuries (8.5% of total)
Wrist: 15 injuries (2.4% of total)
Finger: 123 injuries (19% of total)
They also provide limited details of each accident, here is limited descriptive data for a random 15 hand injuries:
Based on this data, it does appear that kickback is a significant factor in hand injuries -- I didn't look at all of the records, but looks like kickback is cited around half the time for hand injuries.
When looking at finger injuries, kickback doesn't appear to be listed as a cause as often:
For comparison, I looked at the distribution of injuries for 1997 (the earliest date they provide downloadable case data for), and the distribution is similar:
Hand: 57 injuries (10% of total)
Wrist: 9 injuries (1.6% of total)
Finger: 145 injuries (25% of total)
I'm not sure what conclusion to make from the data -- if the gloves provide protection for the hands and fingers, they appear to be a good investment and will protect you from a common source of injury. If they are only effective for hand/wrist injuries, those injuries only account for around 10% of all reported chainsaw injuries, so there may be less value in the gloves.
Yes, it turned out to be a faulty coil. The replacement coil came with its own flywheel, so perhaps there was a design flaw in the original.
It took some work to insert the new coil. Setting the gap between the flywheel and coil (0.3mm) was a little fussy. Had some automotive feeler gauges lying around that helped with that. And getting the little spark plug cap/insulator properly on the coil was a bit of a pain.
After buttoning it up, it started on the first pull. So I'm fairly certain it was the coil.
Best Answer
They are generally called "bar bolts". These bolts are often pressed into the chain saw housing from the back side, it can be a complicated repair requiring significant disassembly of the saw.
Also, I do not see them on the parts diagram. This doesn't mean they are not available, but to find out you would have to call Ryobi customer service and explain what you need.
check out this video