Euro cylinder door lock, no fixing bolt but won't budge!

Section62

jd93 said:

The hole below i believe is where the long fixing bolt should be, and there is no screw present. 

taking some new pictures with light, i can see something in the hole right in that could be perhaps the blot snapped off in the hole, therefore assuming i'd need to snap the lock annoyingly.

What you can see in the hole is a hex grubscrew which you need a long enough hex key to unscrew (aka "Allen Key").

Be careful when unscrewing that the screw doesn't drop down into the mechanism - hopefully the installer used one which is long enough that the end will protrude out of the door so you can grab it wih fingers before it fully unscrews from the Euro barrel.

grumbler

jd93 said:

...

The screw that looks like it should be the fixing bolt pictured above with an arrow, is a tiny 5m screw that holds the silver unit in place for the door, not related to the eurocylinder..

5m would be a HUGE bolt, but if you mean 5mm, it's not 'tiny' and is exactly the size of a bolt for a euro cylinder.

Section62

grumbler said:

jd93 said:

...

The screw that looks like it should be the fixing bolt pictured above with an arrow, is a tiny 5m screw that holds the silver unit in place for the door, not related to the eurocylinder..

5m would be a HUGE bolt, but if you mean 5mm, it's not 'tiny' and is exactly the size of a bolt for a euro cylinder.

I suspect the OP is talking about length rather than diameter - I think it likely the pozi screw (the one indicated by TIW's yellow arrow) is simply holding the trim in place and is therefore short (aka 'tiny') because it needs to be to avoid fouling the mechanism... i.e. it doesn't go all the way through to the cylinder.

As per my previous post, I think this cylinder is held in place by a hex grubscrew which is visible in the hole indicated by the OP's red arrow. (and the grubscrew being visible may depend on the position of the deadbolting mechanism).