Eq5 mount grub screw replacement

[djpaul]

On my skywatcher eq5 there's a main bolt to hold down my vixen plate plus a safety grub screw with a fiddly hex head. Dies anyone happen to know the size in mm of that screw as I want to replace mine with something better.

Paul 

[almcl]

On the one that came with my EQ5, the screw is an M4 thread and the head takes a 3mm Allen key.

[djpaul]

Just tried a thumb screw off a spare 2 inch to 1.25 reducer 

Fits perfectly

Paul

[djpaul]

Ive now ordered a couple of good quality stainless steel m4 x 25mm thumb screws to do the job properly.

Many Thanks Al