by Skywatcher » Tue Sep 29, 2020 12:21 pm
Hi PH
My experience with these caps is if you twist an pull, you end up fighting with them to get them back in again. What I have found is if you turn them counter-clockwise as far as they will go before pulling on them, you'll feel a small detent as the cap locks in the open position. Once the cap has locked in the open position, it will stay there until you install it back into the opening and turn it clockwise to close it again. If you don't feel the detent on opening, you have a bum cap, whit is what it sounds like you had. All the best,
Sky
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