Replacement Master cylinder spy glass

[skaterboy]

Looking at changing the level glass in the master cylinder have purchased a replacment from Norbo. Reading the instruction it would appear the replacement is fixed in with a type of gasket- silicone sealant. Is this right was thinking of using a type of expoxy resin. Has anyone replaced a spy glass in there master cylinder?
Just feel it may fall out if sealed with a silicone sealant

[arrow]

I would have thought it is also a press fit.

[skaterboy]

It is not a bad fit but by no means a interference fit. Will have a chat with Norbo tomorrow

[tippo]

Have just refitted an original sight glass in my m/c with an 'O' seal and a smear of non setting gasket goo (yamabond). Seals well and seemed to line up with the horse shoe clip pretty well.

I guess it aint a factory soln but it seals and looks OK