Pointing to nosing joints

[goshawker]

Am well along in constructing a patio 12 years after we moved in!
Laying is planned for this weekend.

We have not yet decided on jointing method although personally i favour spending the extra and using a modern resin system and hopefully not have to worry about it many years.

My question is really how would i go about using such a system where you open joints at a step nosing e.g. an open end and nothing below to retain the mortar whilst its curing? The overhang will be about 10 to 15mm I guess.
I could fashion a temporary timber soffit but is there a better way or should I just use a wet mortar?

Slabs are 900x600 limestone 25mm thick.

many thanks

[r44flyer]

Lump of modelling clay or similar, wait for mortar to go off, peel away.

[lutonlagerlout]

we use 70mm gaffer tape
i piece under and 2 each side to hold the one under
cheers LLL

[goshawker]

Thanks Guys couple of options. Will probably go with the gaffer tape...at least see how well it will adhere first.

Just need to lay it now...30degrees this weekend!