Share 'Fluid swap? (Mathmos Astro)'

Hello - Just a bit of an appeal for information for anyone who has experience of lamp bottle ‘transplants’ (particularly Mathmos)Have never been much of a 'tamperer', but having recently received a couple of fairly disappointing Astro bottles, I thought I might attempt to salvage the situation a bit by looking at them as potential ‘candidates’ for a fluid swap
 
In theory this should be straightf…