size of nut

[Topdad]

Anyone know the size of the securing nut on the indent plunger on the bottom of s/w arm /plunger gearbox ,

[morris]

I just measured a spare one I had lying around. 19 tpi and 5/8" diameter which comes pretty close to 3/8 BSP?

[morris]

Bob, hope you didn't rush out to buy a tap and die?
Closer inspection showed it's more of a 20 tpi. 

[chaterlea25]

Hi Bob,
Reply sent to your PM
5/8 x 20 and 1/4in thick,
Hex is 7/16W (sparkplug socket)

John

[Topdad]

Thanks guys 
Morris ,no problem, by the way I've always liked your avatar " the busted knuckle " always makes me chuckle ( see how I did that !! )  so need to ask if you have any problems with me stealing it as a name for my garden Gazebo /bar mancave etc of course when in England you'd be welcome to call in to check that it was done tastefully as well as having a few   

[morris]

need to ask if you have any probleem with me stealing it

Go ahead. If it's for a bar you have my blessings...
But to avoid copyright problems you may need to call it "Ye olde busted knuckle" 

of course when in England you'd be welcome to call in to check that it was done tastefully as well as having a few   

I'll keep you to that!! I'm always in for a beer and a chuckle... which I had when reading the title of this post.