Smart move, francesco. Just realize that by using that sub-standard equipment, you're now missing out on perhaps the most important part of this phase of your training - attempting that next rep even when you feel scared. See Nick's
Learning To Grind. It's a game changer when you panic as you start to your rep, but keep tight, bounce, fight through
The White Noise of Heavy, and get back to lockout.
Keep doing what you're doing, because you're working with what you have, but know for you and your future clients that this is an important part of the late novice stage.
Keep at it!