I have a Poulan 810EPT electric motor that has worked great but now my attachments won't slip and lock into the end of the shaft. Can't see any obstruction except maybe the flexible cable on the attachments won't go into receptacle in the motor shaft.

check for a roll pin in the gear or shaft that has sheared off
check that the square end of the drive shaft is not rounded off or that the square drive in the gear is in fact locking on the drive shaft and not turning from worn out

Square drive on the end of the drive shaft has to line up with the drive on the output of the clutch.

find the little square attachment and place on the end of the dremel tool. I didid the same thing. Worked fine after I put the other part on.

there is a plastic bushing at the end on the steering wheel shaft that holds it in place in line to the they are about $12 look on sears parts online it's shaped like a t

Does the front drive shaft turn? Maybe the hubs aren't locking in. If the hubs don't lock, then even if the transfercase is functioning you still won't turn the front tires. Hope this helps, Shaun

One way is air operated impact wrench. If you don't have access to that particular tool, you can take the sparkplug out and slip in enough rope so engine will not turn past top dead center. It will lock the crank shaft enabling you to loosen clutch nut without harming anything on the engine. When done, pull rope out, reinsert sparkplug and you're ready to go.

Ian should be attached to the axle with a bolt just remove the bolt and the tire/hub will come off the axle. Now if the hubs are rusted to the axle and the tire and hub won't come off easily then you will have to resort to using a tool to wedge between the motor and the hub I use a tie-rod end tool works great you just have to beat the hell outta it sometimes to get them off. Be carefull and work on it till you see some movement of the hub moving up the axle penetrating oil might help if you have some Hope this helps

Try a now spark plug first. If it is still hard to start then it is probably because of low compression due to worn rings and these need to be replaced.

Inside the fuel tank, there is a small flexible fuel line with a float (or sinker) attached. The float (or sinker) is supposed to keep the end of the fuel line submerged in the fuel. The float (or sinker) may be detached, or stuck, or it may be saturated and won't float (if it's the floating kind).
Good luck, Al K

Sure you can...that would be called the crankshaft assembly. You can find it here...along with any other parts you may wish/need. These low-end trimmers are practically considered disposable household items nowadays and a lot of people treat them as such. Look for the crankshaft assembly here:
http://www.ereplacementparts.com/poulan-pro-pp125-gas-trimmer-parts-c-16962_17820_18351.html
I am a little surprised at the lower cost.