My go-to fun quad is a Diatone ET150 with 1306 3100kv motors.  I discovered a problem when the weather got cold and/or damp because the small endbell was hard to grip and would spin when trying to remove the nut.  So what I do now is wrap one of these silicone wristbands around the endbell and that gives you a soft grip and extra leverage to undo the nut.  It saves wear and tear on your fingertips for larger motors with sharp vertical vents too.  You probably have tons of these around the house from giveaways so stick one in your spare prop bag.
I ruck my gear to the field in a 40L hiking backpack.  It's small enough to hold everything I need for basic repairs and this little Dal prop tool helps keep the kit tidy.  It has 8mm and 10mm openings.  Find it with a search for around $5.  Couple this tool with the silicone band and you will be a prop changing machine!

Do you have a link where we can buy them from?

(13-Jan-2016, 10:57 PM)Oscar Wrote: Do you have a link where we can buy them from?

I found them while shopping for HS1177 cams at Surveilzone.  http://www.surveilzone.com/Propeller-Tig...ool-g-1470

(14-Jan-2016, 01:18 AM)Arknabbit Wrote:

(13-Jan-2016, 10:57 PM)Oscar Wrote: Do you have a link where we can buy them from?

I found them while shopping for HS1177 cams at Surveilzone.  http://www.surveilzone.com/Propeller-Tig...ool-g-1470

Cool! Thanks buddy.

This is an option too (UK):

http://www.halfords.com/cycling/bike-mai...h-8-9-10mm
or
http://www.ebay.co.uk/itm/Acor-Socket-Y-...20f3f3c17a

Only ~£5

They have 3D printable versions too. I found one on Thingiverse.

All I use is a thick rubber band - the type that the postman drops while doing his round - and a ratcheting 1/4" screwdriver style socket drive.

Life is too short to use nylock nuts without a ratcheting driver!