I’ve got some 6mm rubber and need to cut a 10mm round hole in it… it’s a replacement footstrap for a kiddie loct bike seat.

Can anyone suggest a way of cutting the holes at all? I’m stumped. Any attempt to do it with a knife will no doubt end in jagged edges that will tear.

Heat a bolt of the right size hold in mole grips and melt through?

10mm steel tube, sharpen the end – give it a good whack.

Use the proper tool. A hole punch, like this:

If you don’t want to buy any tools just drill a 10mm hole in it.

What gravity-slave said. (But, use one with 10mm written next to it, in pink).

a bit of steel tube of the right size, a vice and a bit of wood.

Sandwich rubber between wood and tube in vice, close vise, pushing tube through rubber cutting nice neat hole. JD.

don’t use darcy’s idea – those circles measure way out !

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don’t use darcy’s idea – those circles measure way out !

Have you been talking to Mrs Darcy?

sharpen a 10 mm pipe.

size isn’t everything

… she definitely said that, inbetween all the crying

2 pieces of wood, vice and a 10mm drill.

Sandwich the rubber between the 2 pieces of wood in the vice, cranked up nice and tight.
Drill through the wood/rubber/wood (in the right place, obvs), bobs your mother’s.

if it’s rubber, fold it in half and use a knife, clamp it to make sure it doesn’t move when cutting

it’s a replacement footstrap for a kiddie loct bike seat.

Of course it is. Are you sure 10mm is big enough for him/her/you to breath through?

A sharp finger nail or oil-based lubricant?

Glock 23 ?

From my tyre slashing days* – dip a sharp knife in diesel and you’ll get a very clean cut.

Presumably a thin vegetable oil would do the same job.

I’d imagine an oiled punch would do the job perfectly.

*Making fenders for my yacht. 🙂

The correct answer is lightly-lubed 10mm hollow punch. Lay rubber on broad flat wood before driving the punch.

Sharpened tubing seem perfectly reasonable suggestions if not fussed about buying a punch.

Use a proper hole punch, it’s no different to making a hole in a leather belt – although my hole punch will probably only go up to about 8mm or so

If you don’t have the right kit pop to a cobbler, I’m sure they’ll be able to do it for you