Neoprene strip 5mm thick x 15mm wide

• Manufacturer: Various
• Product ID: Various

Provides resistance equivalent to a spring when used with a switch for a fire button

Supplier Links

https://www.amazon.co.uk/Neoprene-Rubber-Black-Self-adhesive-Sponge/dp/B07QDN46DK/ref=sr_1_5

Indicative Pricing With Allowance for P&P

You only need a few cm of this but you'll probably have to buy at least one metre. The product above is 5m long and costs £5, but you'll probably find shorter lengths on eBay for less, hence my indicative price of £1.

£1

Substitutions

You could use anything wider and cut it down. It does need to be about 5mm thick though to get a nice resistance.