Chainsaw Repair

Rambling on just a general critique .You can not expect to drill an accurate hole with a hand held drill motor which is exactly what has been shown .You need to have the part clamped and trued with the drill spindle .To further add you cannot get an accurate hole for a threaded fastener using a twist drill ,it should have a reamer on the last pass .Reamers  are not that costly on flea bay .
If I would have done it the part would have been clamped on the table of a milling machine then use a multi pass drilling method with the hole entrance chamfered .
Something like a threaded hole on a car trailer or like isn't that important but on an engine it certainly is or any other prescision type of thing .I'm real anal on my  machining work .Might take longer but certainly is better result .If it's worth doing do it right  .