When your neighbour returns ask him to speak to your local council and request a register form,he can include info such as keyholders so in the event of another swinger or a break in a keyholder is contacted and access can be gained to his property.
I too understand your problem... But you should not have gone onto his property or taken it upon yourself to silence the sounder.Not only is this a criminal act you also put your self at risk.
In future Contact your council/envo health,some one will come out to the nuisance property and slap it with a notice.If they have no response within 30 mins they call in tradesmen who can enter the property and shut the system down.
As a rule they like to change the lock so you are forced to contact them for the keys and obviously pay all costs and possibly a fine.
On the other hand though your neighbour may thank you if you successfully silenced it because you spared him cost's and a possible fine.
concerned neighbour
January 2013