Here's my opinion on this issue ... will Sidney get his head stuck between the bars? If there is no way, then I wouldn't have an issue with saying, "sure - go ahead" ... wait a second (grabs tape measure and quietly goes over to Hamlet's cage and measures ... )
Hamlet's bar spacing is - oh god - Hamlet's bar spacing is one inch ... Mac's is 1/2 inch ... A sunny and a Jenday are the same size ("x factor" being the number of pecans/almonds consumed by each bird) go ahead ... there isn't any reason you shouldn't use this if you want to ...
I measured the spacing on his and it actually over 5/8th _ I did the pecan test hold pecan gently out of reach and watch him strain for beak makes it through bars but nothing else did. LOL