spacer for silencer 1"-tube on revolvers

Thing is rearward spacer for 1" silencer tube which is wrapped around barrel for increasing expansion space. Tube must be placed around barrel, forward spacer to index barrel is also needed. threaded barrel with 3mm nut should be used to hold back forward spacer and this spacer. then spacer holds back rear end of silencer. this omits the necessity to index threading and silencer to barrel, as silencer tube indexes itself with this spacer and forward spacer.
btw forward spacer should be metal t