7" angle grinder flange/nut

[inchpincher]

I've picked up a second hand Sealey 7" air angle grinder to use on some body work with one of these miracle shrinking discs. Problem is that the retaining nut sits proud of the disc and as recommended in the instructions i will probably do more harm than good to the panel if i'm not careful

All my 4.5" grinders have the correct sort of flange/nut but it's m14 and the sealey appears to be 5/8 Whitworth (11 tpi) with a diameter of 15.5mm (39/64 or possibly 5/8" ). I've had a bit of a google but no joy, any clues to where i might pick one up or should i just grind this flange down?

Thanks,

ben

ps. some pics to illustrate...

 

[the snooper]

have a look here it shows the correct disc for your grinder

 

[inchpincher]

Got one for the 4.5" too but want to get the big boy cooking

 

[inchpincher]

Think i found the correct nut on ebay after much surfing, will report back on these discs too...

 

[eddie49]

5/8 x 11 is the standard thread on an angle grinder in USA ( rather than the European M14 ), so eBay.com should be a source for the correct nut.