Advice wanted: Bryans Gapwin screws & spring

Somebody knows... Maybe you?
User avatar
spanky
Posts: 15
Joined: Tue Jan 03, 2017 5:42 pm
Location: Glasgow

Advice wanted: Bryans Gapwin screws & spring

Post by spanky »

Right, received a replacement pay cup from jingle, but am having trouble fitting it. I can't quite get all four screws in. I can't work out why, it's as if there's a tolarance problem.

As you can see, the screws aren't Pozidriv. In fact, they're really bolts, on the other side are square nuts.
Screwsa.jpg

Are these suitable screws? Are they original? Should I replace them with something else?

Question 2. The spring at the very bottom, responsible for firing the ball, has been overstretched and therefore its action is quite feeble. This often prevents the ball from being launched.
Spring-detaila.jpg

Are replacement springs available, if so has anyone got one? If not, should I get obtain one of a similar length?
pennymachines
Posts: 5575
Joined: Wed Nov 06, 2002 12:12 am
Location: The Black Country

Re: Advice wanted: Bryans Gapwin screws & spring

Post by pennymachines »

The (round or square) coin cups on Bryans allwins are held in place with unslotted, dome headed, chromed coach bolts.

Yes, sounds like you need a new spring of the original length and gauge. Never used them but Ashfield Springs of Nottingham stock a range: https://www.ashfield-springs.com/shop/e ... ngs-3-10mm
User avatar
spanky
Posts: 15
Joined: Tue Jan 03, 2017 5:42 pm
Location: Glasgow

Re: Advice wanted: Bryans Gapwin screws & spring

Post by spanky »

Thanks, that all sounds very sensible.

However, coach bolts I have seen have a square bit behind the head to prevent them spinning. How does that work regarding the holes in the pay cup? Sorry for being thick.
User avatar
JC
Posts: 975
Joined: Sun Feb 19, 2006 10:38 pm
Location: Kent
Contact:

Re: Advice wanted: Bryans Gapwin screws & spring

Post by JC »

You're not being thick. From memory, I don't recall seeing coach bolts used with the later square (or rather, rectangular) cups. I think they were normally slotted pad-head machine screws, but would no doubt vary from machine to machine - example, the cross-headed screws on your machine look to be original.
widget2k4
Posts: 1385
Joined: Tue Aug 27, 2013 8:32 am

Re: Advice wanted: Bryans Gapwin screws & spring

Post by widget2k4 »

I thought they all had these in them?
Attachments
15119029876991568924215a.jpg
User avatar
JC
Posts: 975
Joined: Sun Feb 19, 2006 10:38 pm
Location: Kent
Contact:

Re: Advice wanted: Bryans Gapwin screws & spring

Post by JC »

No doubt some did, as I said, they will vary depending on the machine and maker.
The point I was making is that I don't recall ever seeing coach bolts (widget, your picture is of a machine screw, not a coach bolt).
pennymachines
Posts: 5575
Joined: Wed Nov 06, 2002 12:12 am
Location: The Black Country

Re: Advice wanted: Bryans Gapwin screws & spring

Post by pennymachines »

The coach bolts were used on the round payout cup surrounds, which had square holes in them. The rectangular cups, with round screw holes, were used post-decimal when Mr Bryan could no longer source the round cups (or they were too pricey). Generally they avoided screw heads on the fronts of games (or filled and painted them) so as not to tempt naughty boys with screwdrivers. :tut
widget2k4
Posts: 1385
Joined: Tue Aug 27, 2013 8:32 am

Re: Advice wanted: Bryans Gapwin screws & spring

Post by widget2k4 »

All my square cups have four of those bolts in with no slot in to turn so couldn't be unscrewed. Never came across one yet with crosshead screws like the picture.
User avatar
spanky
Posts: 15
Joined: Tue Jan 03, 2017 5:42 pm
Location: Glasgow

Re: Advice wanted: Bryans Gapwin screws & spring

Post by spanky »

Hmm

Bit baffled now.
pennymachines
Posts: 5575
Joined: Wed Nov 06, 2002 12:12 am
Location: The Black Country

Re: Advice wanted: Bryans Gapwin screws & spring

Post by pennymachines »

OK, so ideally you want Whitworth thread, unslotted, chromed, roundhead machine screws (similar to Widget's pic) of a gauge to fit though the holes, plus lock washers and nuts to match. I've cheated in the past by using easily obtained zink plated or stainless roundhead slotted machine screws, melting silver braze into the slots and buffing to a high shine.
Post Reply

Who is online

Users browsing this forum: Google [Bot] and 8 guests